Which two planets in our solar system do not have any moons?.
The top pair of pliers failed to loosen a stubborn bolt, but the bottom pair successfully removed it.
Explain why the bottom pair of pliers might have made it easier to loosen the bolt, while the top pair failed.
Use your knowledge of mechanical advantage and ideal mechanical advantage to describe how simple machines can change the relationship between distance and force.
The top pair of pliers failed to loosen a stubborn bolt, but the bottom pair successfully removed it. Because the contact between the bolt and the pliers working surface is less.
What is mechanical advantage ?Mechanical advantage is a measure of the ratio of output force to input force in a system, it is used to obtained efficiency of the given mechanical machine.
The efficiency to open the stubborn bolt depends upon the contact between the working surface of the pliers and the bolt.
The contact between the bolt and the top pair of pliers working surface is less. Its mechanical advantage is less.
Hence, the top pair of pliers failed to loosen a stubborn bolt, but the bottom pair successfully removed it.
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When electrons are accelerated by 2450v in an electron microscope they will have wavelengths of
a)8.113nm
b)0.622nm
c)0.811nm
A man walks for 2 hours at a speed of 3m/s. How far does he travel?
First you get the data:
Velocity (v) = 3m/sDistance (d) = ??Time (t) = 2hrTime conversion: hours to seconds:
1 hour = 3600 seconds[tex]\bf{2\not{h}*\left(\dfrac{3600 \ seg}{1\not{h}}\right)=7200 \ seg }[/tex]
We calculate the distance, using the formula:
[tex]\bf{d=t*v }[/tex]
[tex]\bf{d=3600\not{seg}*3\frac{m}{\not{m}} }[/tex]
[tex]\bf{d=21600 \ m}[/tex]
Answer: I travel to 21600 meters.
if the forces on an object are greater than zero, the motion of an object will what?
what will the motion of the object do??
If the forces on an object are greater than zero,the object will definitely in the motion. This concept in accordance with law of inertia.
What is force?Force is defined as the push or pulls applied to the body. Sometimes it is used to change the shape, size, and direction of the body.
Newton's law of inertia states that a body wants to continue its motion until the external force is not acted on it.
Hence, if the force is grater than zero, the body will be in motion.
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Why is water sometimes called the universal solvent.
Answer:
Because it can desolve many many things.
Explanation:
A pencil has a density of 0.875 g/ml. It has a volume of 4.0 ml. Find the mass
Answer:
To find the mass using density and volume we just multiply them against each other which causes ml to cancel and just leaves us with grams which represents how much the item weights.
[tex]mass=density*volume[/tex]
[tex]mass=0.875\frac{g}{ml}*4.0\ ml[/tex]
[tex]mass=3.5\ g[/tex]
Therefore, our final answer is that our pencil weight 3.5 grams
Hope this helps! Let me know if you have any questions
What is the study of interactions between humans and the environment
Answer:
Environmental science is the dynamic, interdisciplinary study of the interaction of living and non-living parts of the environment, with special focus on the impact of humans on the environment.
Explanation:
How many protons, electrons, and neutrons are present in an atom of cr-24?
The number of protons, electrons, and neutrons in the atom of cr-24 is 28, 24, and 24 respectively.
What is atom?An atom is the smallest unit of matter, consisting of the positively charged nucleus and the electrons which move around it. The atom can not be divided further.
The atom of a matter is made by three elements-
1) Neutron-Neutron is the element of an atom, which has zero charge.2) Proton-Proton is the element of an atom, which has a positive charge.3) Electron-Electron is the element of an atom, which has a negative charge.The atom of cr-24 has the atomic number 24. The atomic number of atom is equal to the number of proton and electron in an atom. Thus,
[tex]\rm Proton=24\\\rm Electron=24[/tex]
Now, if this atom has the mass number of 52 (most common). Then the number of neutron is,
[tex]\rm Neutrons=Mass\; Number-Atomic\; Number\\\rm Neutrons=52-24\\\rm Neutrons=28[/tex]
Thus, the number of protons, electrons, and neutrons in the atom of cr-24 is 28, 24, and 24 respectively.
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what is the primary way the metamorphic rock formed
Hello always here to help!!!!
__________________________
Existing rocks come together under great heat and pressure to generate metamorphic rocks. Marble, schist, slate, and quartzite are examples of metamorphic rocks. Heat and pressure cause chemical changes in minerals, resulting in metamorphic rocks. They are frequently encountered near magma, but unlike igneous rock, they do not melt.
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What will be the speed of an airplane that normally flies at 200 km/h when it encounters a 80km/h wind from the side (at a right angle to the airplane)
The speed of an airplane that normally flies at 200 km/h when it encounters an 80 km/h wind from the side will be 215.4065 m/sec.
What is speed ?Speed is defined as the rate of change of the distance or the height attained. It is a time-based quantity. It is denoted by u for the initial speed while v for the final speed. Its SI unit is m/sec.
The resultant or the net value of the velocity is found as;
[tex]\rm V_{net}=\sqrt{ V_A^2+V_B^2} \\\\ \rm V_{net}=\sqrt{(200)^2+(80)^2} \\\\ V_{net}=\sqrt{46400} \\\\ V=215.4065\ km/h[/tex]
Hence, the speed of an airplane will be 215.4065 m/sec.
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A person lowers a 1 kg basket down to the floor. At one instant while the person is doing this, the basket has an acceleration straight down of 2.0 m/s2 . What is the lifting force that the person is applying at this instant
The lifting force applied by the person in lowering the basket is determined as 7.8 N.
Lifting force applied
The lifting force applied by the person is determined from Newton's second law of motion.
F = mg - ma
F = m(g - a)
where;
g is acceleration due to gravity acting downwardsF = 1(9.8 - 2)
F = 7.8 N
Thus, the lifting force applied by the person in lowering the basket is determined as 7.8 N.
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When a constant force is applied to an object the acceleration of the object varies inversely
Answer:
See below
Explanation:
to the force of kinetic friction
Find the equivalent resistance of this circuit.
[tex](R_1 +R_2)||R_3\\\\R_{eq} = \left(\dfrac 1{R_1 + R_2} + \dfrac 1{R_3}} \right)^{-1}\\\\\\~~~~~~=\left( \dfrac{1}{100+200} + \dfrac 1{600} \right)^{-1}\\\\\\~~~~~~=\left( \dfrac{1}{300} + \dfrac{1}{600} \right)^{-1}\\\\\\~~~~~~=\left(\dfrac{3}{600} \right)^{-1}\\\\\\~~~~~~=\dfrac{600}3 \\\\\\~~~~~~= 200~ \Omega[/tex]
why is speed relative?
Because the measurement of motion is dependent on the observer's position or reference frame.
how much current flows through a 100- ohm device connected to a 1.5- volt battery
Answer:
0.015A
Explanation:
I=V/R
=1.5/100
0.015A
Just apply ohm's law
1. Which wave phenomenon is illustrated by this image?
O A. Refraction
O B. Diffraction
O C. Diffusion
O D. Interference
Answer:
Explanation: O B. Diffraction
What is the potential at a distance of 5. 0 ? 10-10 m from a nucleus of charge 50e?
The electric potential at a distance from a nucleus of charge 50e is 144 Volts.
What is electric potential?The potential is the work done by the test charge to move it from infinity to a particular point.
The potential is given by the relation
V = kQ / r
The distance of a point from the nucleus is 5.0 × 10⁻¹⁰ m and the charge on the nucleus is 50 e = 50 × 1.9 × 10⁻¹⁹ C.
k = 9 × 10⁹ kg-m²/s²-C²
Here, Q is the charge, r is the distance and k is the constant.
Substituting the value into the equation and solving, we get
V = 144 Volts
Thus, the potential at a distance from a nucleus of charge 50e is 144 Volts.
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The strength of force is expressed by?
a. weight
b. mass
c. magnitude
d. longitudinal force
Answer:
a
Explanation:
maybe b but I think it's a
why are sicissors concidered a first class lever
Answer:
The Fulcrum is the pivot in the middle and the Force is applied with your hand at the end. The item being cut has a “Shear” force applied to it by the blades.
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A charge Q acts on a test charge to create an electric field, E. The strength of the field is measured at 8 N/C at 40 cm away. What would the field strength be 80 cm away with a charge of 1/2 Q? Explain.
The electric field strength created by a charge decreases with increasing distance from the charge. The relationship between the electric field strength (E) and the distance (r) from the charge is given by the inverse square law:
E ∝ 1/r^2
Let's consider the given scenario:
At a distance of 40 cm (0.4 m) from the charge, the electric field strength is measured as 8 N/C.
We want to determine the electric field strength at a distance of 80 cm (0.8 m) from the charge when the charge is reduced to 1/2 Q.
First, we can set up a proportionality based on the inverse square law:
(E1)/(E2) = (r2^2)/(r1^2)
Substituting the given values:
8/E2 = (0.8^2)/(0.4^2)
Simplifying the equation:
E2 = 8 * (0.4^2)/(0.8^2)
E2 = 8 * 0.16/0.64
E2 = 2 N/C
Therefore, at a distance of 80 cm from the charge, when the charge is reduced to 1/2 Q, the electric field strength would be 2 N/C.
The strength of an electric field depends on the magnitude of the charge creating the field and the distance from the charge. In this case, since the charge is reduced to 1/2 Q, the electric field strength is also halved.
Additionally, as we move twice as far away from the charge (from 40 cm to 80 cm), the electric field strength decreases according to the inverse square law. As a result, the electric field strength is reduced to 2 N/C at a distance of 80 cm.
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For nitrogen to be a liquid, its temperature must be within 12.78 °f of –333.22 °f. the equation |x 333.22 | = 12.78 can be used to find x, which represents the maximum and minimum temperatures at which nitrogen is a liquid. is the maximum temperature at which nitrogen is a liquid. is the minimum temperature at which nitrogen is a liquid.
The maximum temperature is -320.44 and the minimum temperature is -333.22.
How is the temperature variation calculated?In this case, there was an increase of 50 °C in the temperature of this object. We say that the temperature variation suffered by the body was 50°C, and this can be determined mathematically through the difference between the final value and the initial temperature value (60 – 10 = 50).
In this case, we have:
[tex]x+ 333.22 = 12.78\\x=12.78-333.22\\x=-320.44[/tex]
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-320.44 is the maximum temperature at which nitrogen is a liquid.
-346 is the minimum temperature at which nitrogen is a liquid
Edwin Hubble proposed that the universe is expanding. How did he support his assertion
Answer: i think Hubble's Law basically states that the greater the distance of a galaxy from ours, the faster it recedes
Explanation:
can anyone pls help me with any of these questions i need it asap for my finals tmrw
Answer:
Answer:2nd question answer is 2.75Answer:2nd question answer is 2.75Explanation:
Mass of ball is missing in your 1st question.
for 2nd question,
Small cart,
m1 = 1.25kg
u1 = 2.5m/sec
v1 = -0.94m/sec ( negative sign indicate opposite motion)
Large cart,
m2 = ?
u2 = 0 m/s
v2 = 1.56 m/sec
from conservation of linear momentum,
m1*u1 + m2* u2 = m1*v1 + m2*v2
1.25*2.5 + m2*0 = 1.25*-0.94 + m2*1.56
3.125 + 0 = -1.175 + 1.56*m2
3.125 + 1.175 = 1.56*m2
4.3 = 1.56*m2
m2 = 4.3/1.56
m2 = 2.75 kg
if they stuck together instead of bounced. then,
total mass of bodies (m)= m1+m2= 4kg
final velocity of bodies (v) = ?
From , conservation of linear momentum,
m1*u1 + m2* u2 = m*v
1.25*2.5 + 2.75*0 = 4*v
3.125 = 4*v
v = 3.125/4
v = 0.78125 m/ sec.
The large cart has a mass of 2.75kg. This can be identified from the law of conservation of momentum. Its unit is kg.s⁻¹/m.
What is the law of conservation of momentum?Momentum is the quantity that describes the motion of the body. The momentum equals the product of mass and velocity. Momentum= Mass/velocity. It depends on the velocity as velocity changes momentum also changes.
The law of conservation of momentum states that the initial and final momentums are the same in the system. It shows that the momentum of the system remains constant, before and after the collision.
In an isolated system of two bodies acting on each other, total momentum remains constant in the absence of external forces. It can neither be created nor destroyed.
Law of conservation of momentum:
Total momentum before collision = Total momentum after the collision
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
From the givens,
Mass of small chair, m₁ = 1.25kg,
The initial speed of the small chair before the collision, u₁ = 2.5 m/s,
The final speed of the small chair after the collision, v₁ = - 0.94 m/s (negative sign opposite sign),
The initial speed of the large chair before the collision, u₂ = 0 (large chair is at rest before the collision),
The final speed of the large chair after the collision, v₂ = 1.56 m/s,
The mass of a large chair m₂ =?
From the conservation of momentum:
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
(1.25×2.5) + (m₂×0) = (1.25(-0.94) + (m₂×1.56)
3.125 + 0 = - 1.175 +( m₂×1.56)
3.125+1.175 = ( m₂×1.56)
4.3 / 1.56 = m₂
m₂ = 2.75kg
Hence, the mass of a large chair, m₂ = 2.75kg.
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A 3600-n force causes a car to accelerate at a rate of 4m/s2. what is the mass of the car?
Answer:
N~ f fric m 1~g The acceleration of the car can be calculated using v2 f v 2 i = 2a x a = v2 2 x = (72000 3600) 2 2 30 = 6:67m=s2 On the other hand, Projecting 2nd Law on the y-axis gives N=mg; For the book to slide o the seat, acceleration should overcome frction: f s < ma sN < ma smg < ma s = 0:650 < a g = 6:67 9:81 = 0:68
Explanation:
write down what should be considered when writting scientific notation
Answer:
Find the original location of the decimal.
Determine if the number will be positive or negative.
Move the decimal point until it creates a number between one and ten.
Count how many times you moved the decimal.
Explanation:
Do you think that push-ups (pushing your body weight up from the floor) or shoulder press (pushing weights above your head) will do a better job of helping you build muscles? Defend your answer using words and equations.
Answer:
Push-ups. Let M1 be the mass of the body and M2 be the mass of weights. Assume that M1 must be heavier than M2. Since M1 is heavier, M1 requires more force, and therefore work to be applied, let F1=M1*g. To bring our body back up, we need a force bigger or equal (if already in motion) to F1.
Let F2 = M2*g
Since F1 has to be bigger than F2 due to mass, we can build an equation for energy. Let X be a displacement, which is equal in both situations. Constructing a change of energy equation we can see that work done to lift the body is greater:
W1=F1*x
W2=F2*x
Where W1 is the work of the hands-on body, and W2 is the work of lifting weights. W1 has to be larger than W2. Since more work in W1, more muscle will be needed to complete a repetition, but only assuming that M1 > M2.
Using the equation (N(t) = N0 e^−λt) Calculate the amount left of a radioactive sample amount N0 if the decay constant is 0.00125 seconds and the time is 180 seconds? (Hint: Your answer will not be a number. Instead, it will be a decimal or percent of the variable N0)
The equation is
[tex]\\ \rm\Rrightarrow N(t)=N_o(e^{-\lambda t})[/tex]
Put values
[tex]\\ \rm\Rrightarrow N(180)[/tex]
[tex]\\ \rm\Rrightarrow N_o(e^{-0.00125(180)}[/tex]
[tex]\\ \rm\Rrightarrow N_o(e^{-0.225})[/tex]
[tex]\\ \rm\Rrightarrow 0.798N_o[/tex]
Or
79.8% of N_o100 POINTS!! PLEASE HELP ASAP. WILL MARK BRANLIEST.
3.) You inspect a bottle of sunscreen to see what radiation it claims to block. You are looking for sunscreen that blocks dangerous radiation from the sun but does not make claims about other types of radiation. Which claim on a bottle would best meet these criteria?
a.Blocks all UV and infrared rays
b.Blocks harmful UVA and UVB radiation
c.Blocks the full spectrum of violet and ultraviolet radiation
d.“Blocks harmful UV and gamma rays
4.) Which description fits a type of electromagnetic radiation that could harm living cells?(1 point)
a. electromagnetic waves with very short wavelengths
b. waves with frequencies low enough that they are not visible
c. radio waves
d. blue light
5.) Which statement correctly describes how a tanning bed machine works?(1 point)
a. It gradually increases the ionizing energy of radiation to the maximum.
b. It matches the amount of sunlight that the skin can absorb..
c. It decreases production of the skin’s protective pigment, which causes damage.
d. It delivers an ionizing electromagnetic radiation called ultraviolet light.
7.) Tanning beds expose the body to a certain type of ultraviolet (UV) light. It has been claimed that this helps the body manufacture its needed vitamin D. Which evidence contradicts this claim?(1 point)
a. Both UVA and UVB light are produced by tanning beds.
b. The skin does not have the ability to absorb any type of UV light.
c. The body needs UVA light, and tanning beds deliver UVB light.
d. The body needs UVB light, and tanning beds deliver UVA light.
8.) Studies show that matter absorbs various types of electromagnetic radiation depending on the frequency and amount of energy they carry. Which sequence of types of electromagnetic radiation is arranged from that with the least to the most energetic photons?(1 point)
a. gamma rays, visible light, ultraviolet, X-rays
b. visible light, ultraviolet, X-rays, gamma rayst
c. ultraviolet, X-rays, gamma rays, visible light
d. X-rays, gamma rays, visible light, ultraviolet
Answer:
the answer is equal to visible light , ultraviolet, x-rays, gamma rayst
The sequence of types of electromagnetic radiation is arranged from that with the least to the most energetic photons will be visible light , ultraviolet, x-rays, gamma rays.
What is electromagnetic radiation?Electromagnetic radiation is a type of energy that is transmitted in incident photons as both magnetic and electric waves.
Electromagnetic radiation has a spectrum with varying wavelengths and frequencies, which gives it different properties.
Electromagnetic radiation is a type of energy that travels in packets of energy called photons as both electrical and magnetic waves.
Wave-particle duality is the name given to this phenomenon. This is a notion that defines how a wave behaves whether it behaves like particles, waves, or both particles and waves.
Hence the sequence of types of electromagnetic radiation is arranged from that with the least to the most energetic photons will be visible light , ultraviolet, x-rays, gamma rays.
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A body is acted upon by a constant force directed towards a fixed point. the magnitude of the force varies inversely as the square of the distance from the fixed point. what is the nature of the path?
a) straight line
b)circle
c)random motion
Answer:
Circle
Explanation:
Actually its Eclipse or ecliptial path.
Force varies inversely with square of distance.
Remember Gravitation?
F=GMm/r²Yes
F is inversely proportional to r²
So it's eclipse
Recheck if a option given or circle is most likely correct