Answer:
Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force
Answer:
An object in motion will stay in motion unless acted on by an unbalanced force.
An object at rest will stay at rest unless acted on by an unbalanced force.
An object in motion will stay in motion, and an object at rest will stay at rest unless acted on by an unbalanced force
(There are three parts to Newton’s First Law of Motion)
An object that is launched from the top of the tower is dense enough that air resistance can be ignored. The object's initial velocity has components (vx = 30 m/s, vy = 20 m/s). What are the components of the object's velocity 3 seconds after launch?
Answer:
The components of the object's velocity 3 seconds after launch are
[tex]v_x = 30[/tex] m/s and [tex]v_y=-9.43[/tex] m/s.
Explanation:
The given components of initial velocity are
[tex]v_x= 30[/tex] m/s,
[tex]v_y= 20[/tex] m/s.
Assuming the y-axis is along the direction of gravitational force, so, the velocity along the x-axis will remain unchanged.
So, the x-componebt of the velocity after 3 seconds, [tex]v_x = 30[/tex] m/s.
Using the equation of motion along the y-direction, the final velocity, v, of a mass after time, t, having initial velocity, u is
v=u+at
In this case, [tex]u=y_y= 20 m/s, a=-9.81 m/s^2[/tex] ( as upward direction is taken as positive)
So, at time, t=3s, the final velocity in y-direction is
[tex]v= 20+(-9.81)\times 3[/tex]
[tex]\Rightarrow v=20-29.43[/tex]
[tex]\Rightarrow v= -9.43 m/s[/tex]
So, the y-component of the final velocity is 9.43 m/s in the downward direction.
Hence, the components of the object's velocity 3 seconds after launch are
[tex]v_x = 30 m/s[/tex] and [tex]v_y=-9.43 m/s[/tex].
The final vertical velocity of the object after 3 seconds is 49.4 m/s.
The final horizontal velocity of the object is 30 m/s.
The given parameters;
initial horizontal velocity, Vx = 30 m/sinitial vertical velocity, Vy = 20 m/stime of motion, t = 3 sThe final vertical velocity of the object after 3 seconds is calculated as follows;
[tex]v_f_y = v_0_y + gt\\\\v_f_y = 20 + 3(9.8)\\\\v_f_y = 49.4 \ m/s[/tex]
The final horizontal velocity of the object is the same as the initial horizontal velocity because horizontal motion is not affected by gravity.
[tex]v_f_x = v_0_x = 30 \ m/s[/tex]
Learn more here:https://brainly.com/question/13533552
As an object falls freely, its
Answer:
acceleration increases or is uniform
Explanation:
Answer:
Both
Explanation:
Newton throws an apple straight up at 10 m/s. What is the ball's velocity
after 1.4 seconds?
Answer:
23.72m/s
Explanation:
The final velocity can be calculated using the formula:
V = u + at
Where; v = final velocity (m/s)
u = initial velocity (m/s)
a = acceleration due to gravity (m/s²)
t = time (s)
Based on the provided information, u = 10m/s, t = 1.4s, a = 9.8m/s²
V = 10 + (9.8 × 1.4)
V = 10 + 13.72
V = 23.72m/s
Add the following vectors together:
35 km at 25 degrees N of E
15 km at 10 degrees E of N
Answer:
The resultant vector is 45.3 N 40.74° North of East
Explanation:
The given vectors can be presented as follows;
35 km at 25 degrees N of E = 35 × cos(25)·[tex]\mathbf{\hat i}[/tex] + 35 × sin(25)·[tex]\mathbf{\hat j}[/tex]
15 km at 10 degrees E of N = 15 × cos(90 - 10)·[tex]\mathbf{\hat i}[/tex] + 15 × sin(90 - 10)·[tex]\mathbf{\hat j}[/tex]
15 km at 10 degrees E of N = 15 × cos(80)·[tex]\mathbf{\hat i}[/tex] + 15 × sin(80)·[tex]\mathbf{\hat j}[/tex]
The sum of the vectors becomes;
∑d = 35 × cos(25)·[tex]\mathbf{\hat i}[/tex] + 15 × cos(80)·[tex]\mathbf{\hat i}[/tex] + 35 × sin(25)·[tex]\mathbf{\hat j}[/tex] + 15 × sin(80)·[tex]\mathbf{\hat j}[/tex]
∑d ≈ 34.33·[tex]\mathbf{\hat i}[/tex] + 29.56·[tex]\mathbf{\hat j}[/tex]
The magnitude of the resultant vector = √(34.33² + 29.56²) ≈ 45.3 N
The direction = tan⁻¹(29.56/34.33) ≈ 40.74° North of East
The resultant vector = 45.3 N 40.74° North of East
* Describe the motion of an
object in which its speed is
constant but the velocity is
changing.
Answer:
To summarize, an object moving in uniform circular motion is moving around the perimeter of the circle with a constant speed. While the speed of the object is...
Two workers are sliding 270 kg k g crate across the floor. One worker pushes forward on the crate with a force of 430 N N while the other pulls in the same direction with a force of 230 N N using a rope connected to the crate. Both forces are horizontal, and the crate slides with a constant speed. What is the crate's coefficient of kinetic friction on the floor?
Answer:
The value is [tex]\mu_ k = 0.249[/tex]
Explanation:
From the question we are told that
The mass of the crate is [tex]m = 270 \ kg[/tex]
The force applied by the first worker is [tex]F_1 = 430 \ N[/tex]
The force applied by the second worker is [tex]F_2 = 230 \ N[/tex]
Generally the kinetic frictional force between the crate and the floor is equal to the force applied by both worker , this is mathematically represented as
[tex]F_f = F_1 + F_2[/tex]
Here [tex]F_f[/tex] is the frictional force and this is mathematically represented as
[tex]F_f = \mu_ k * m * g[/tex]
So
[tex]\mu_ k * m * g = F_1 + F_2[/tex]
=> [tex]\mu_ k * 270 * 9.8 = 430 + 230[/tex]
=> [tex]\mu_ k = 0.249[/tex]
4. What is the correct formula for density?
D=m/w
M= V x D
D= m/v
D=m+v
Answer:
M=m/v dhdfhdyvgzrhtcgvygvvy
Answer:
D= m/v
Explanation:
The formula for density is D = M/V, where d is density, M is mass, and V is volume. Density is equal to Mass only when divided by the volume.
PLEASE HELP!!! ILL MARK BRAINLYEST!!!!
What type of change is melting ice?
A. physical
B. chemical
Answer:
A. physical
Explanation: When you melt an ice cube (H2O), you have a physical change because you add energy. You added enough energy to create a phase change from solid to liquid. Physical actions, such as changing temperature or pressure, can cause physical changes. No chemical changes took place when you melted the ice.
i hope this helped good luck:)
which force is a contact force?
A. a magnet pulling
B. a bicycle breaking
C. Lightning forming
D. Leaves falling
Answer: The answer is B.
Explanation: Trust me, i'm right.
what is the answer to this?
Answer:
c
Explanation:
Help I don’t get it
If you help you get brainliest and 50 points
It’s science
Answer: i cant help u with that its a grade above me
Explanation:
Put the following equipment in order from smallest to largest
Marble Table, Chocolate Tempering Machine, Pastry Bag,
Sifter, Commercial Dough Sheeter, Steam Jacketed Kettle,
Rolling Pin, Parisian Scoop, Chinois, Pocket Thermometer,
Immersion Blender, Robot Coupe
Answer:
Parisian Scoop
Pocket thermometer
Pasty Bag
sifter
chinois
Rolling Pin
Immersion Blender
Chocolate tempering machine
Robot Coupe
Steam Jacketed kettle
marble table
commercial dough sheeter
Explanation:
Really it could differ dependent on model variety of each item
what is the specific heat of an unknown substance if a 2.50 g sample releases 12 calories as its specific heat capacity is 0.96 J/gC. What is the temperature change?
Answer:
1) The specific heat is the heat required to be added to a unit mass of the substance to cause a unit rise in its temperature
2) The temperature change is 20.92°C
Explanation:
The given parameters are;
The mass of the substance, m = 2.50 g
The heat released by the sample, ΔQ = 12 calories = 50.208 J
The specific heat capacity of the substance, c = 0.96 J/(g·°C)
Therefore, we have;
Heat released, ΔQ = Mass, m × Specific heat capacity, c × Temperature change, ΔT
Substituting in the known values gives
50.208 J = 2.50 g × 0.96 J/(g·°C) × ΔT
ΔT = 50.208 J/(2.5 g× 0.96 J/(g·°C)) = 20.92°C
The temperature change = 20.92°C
For the winter, a duck flies at 15 m/s due south against a gust of wind due north. If the wind is blowing at 5 m/s, calculate the resultant velocity of the duck.
Answer:
Explanation:
The north direction is towards the positive y direction on the coordinates axis and the south is towards the negative direction of the coordinate axis.
If a duck flies at 15 m/s due south against a gust of wind, then the duck velocity will be -15m/s
If the wind is blowing at 5 m/s due north, the velocity of the wind will be +5m/s
The resultant velocity of the duck will be the sum of the velocity along the y - component = -15 + 5 = -10m/s
Hence the resultant velocity of the dock is -10m/s
If the body temperature of a person is recorded as 37°C, what is the person’s body temperature in K? Round your answer to the nearest whole number. PLEASE HELP I REALLY NEED IT
Answer:
300 kelvin
Explanation:
Look at SS and answer
Why is the Ring of Fire a very geologically active part of the earth?
Question options:
The dense Pacific plate is being subducted from multiple directions.
The plates surrounding the Pacific are diverging and increasing the size of the Pacific plate.
The Pacific plate is surrounded by a hot spot.
Why do many scientists work in groups?
a.
To generate new ideas
c.
Because it is too expensive to work on their own
b.
To make sure that the work is accurate
d.
So there is always someone in lab to monitor experiments
Answer:
I well say to make sure that the work is accurate
Explanation:
I hope this is right
This 90 kg anvil is about to fall from a 0.9 m high bench. What is its PE?
Use g = 9.8 m/s2 for the acceleration due to gravity.
Answer:
Option D. 793.8 J
Explanation:
From the question given above, the following data were obtained:
Mass (m) of object = 90 Kg
Height (h) = 0.9 m
Acceleration due to gravity (g) = 9.8 m/s²
Potential energy (PE) =...?
Potential energy is simply defined as the energy possessed by an object by reason of its position. Mathematically, it can be expressed as:
PE = mgh
Where:
'PE' is the potential energy.
'm' is the mass of object.
'g' is the acceleration due to gravity.
'h' is the height to which the object is located.
With the above formula, we can obtain the potential energy, PE as follow:
Mass (m) of object = 90 Kg
Height (h) = 0.9 m
Acceleration due to gravity (g) = 9.8 m/s²
Potential energy (PE) =...?
PE = mgh
PE = 90 × 9.8 × 0.9
PE = 793.8 J
Therefore, the potential energy of the object is 793.8 J
Develop a logical argument as to why television satellites, which broadcast information as electromagnetic radiation, can send signals from the vacuum of space?
The correct answer to this open question is the following.
Although you did not include options for this question, we can say the following.
Trying to be clear and concise, television satellites, which broadcast information as electromagnetic radiation, can send signals from the vacuum of space because electronic radiation can travel throughout space with no medium that transports it. Electronic radiation needs no material channel or medium to travel such as wires or cable.
That is how technology has developed wonders such as satellite communications for telephone, TV, or the internet. Information, data, sound, and images travel through transverse waves that easily move through the vacuum of space.
Electromagnetic radiations are defined as waves that do not require a medium for propagation. The EM waves have electric and magnetic vectors that do not require any medium to propagate.
The arguments can be explained as:
The Television antennae receive the signals in the form of electromagnetic waves.
The waves are transmitted from the satellites present in space. These waves are then transmitted to the TV station, where the information is then broadcasted. Other electronic devices such as cellular phones, computers, and FM radios have been developed using the propagation of the EM waves.
Thus, the EM waves do not require propagation due to which the signals can be easily transmitted from space.
To know more Electromagnetic Waves, refer to the following link:
https://brainly.com/question/8553652
In a ballistics test, a 21 g bullet traveling horizontally at 1200 m/s goes through a 35-cm-thick 300 kg stationary target and emerges with a speed of 950 m/s . The target is free to slide on a smooth horizontal surface.
Complete Question
In a ballistics test, a 21 g bullet traveling horizontally at 1200 m/s goes through a 35-cm-thick 300 kg stationary target and emerges with a speed of 950 m/s . The target is free to slide on a smooth horizontal surface.
a
How long is the bullet in the target? ____ s
b
What average force does the bullet exert on the target? _____ N
c
What is the target's speed just after the bullet emerges? _____ m/s
Answer:
a
[tex]t =3.256*10^{-4} \ s[/tex]
b
[tex]F = 16124 \ N[/tex]
c
[tex]v_1 = 0.0175 \ m/s[/tex]
Explanation:
From the question we are told that
The mass of the bullet is [tex]m = 21 \ g = 0.021 \ kg[/tex]
The horizontal speed is [tex]u =1200 \ m/s[/tex]
The thickness is [tex]s = 35 \ cm = 0.35 \ m[/tex]
The mass of the block is [tex]m_1 = 300 \ kg[/tex]
The emerging speed is [tex]v = 950 \ m/s[/tex]
Generally from kinematic equation
[tex]v^2 = u^2 + 2as[/tex]
So
[tex]a = \frac{v^2 - u^2}{2s}[/tex]
=> [tex]a = \frac{ 950^2 - 1200^2}{2 * 0.35}[/tex]
=> [tex]a = -767857.14 \ m/s^2[/tex]
Gnerally the time taken is mathematically represented as
[tex]t = \frac{ v- u}{a}[/tex]
=> [tex]t = \frac{ 950 - 1200}{-767857.14}[/tex]
=> [tex]t =3.256*10^{-4} \ s[/tex]
Generally from law of momentum conservation we
[tex]m *u + m_1 * u_1 = m * v + m_1 * v_1[/tex]
[tex]u_1[/tex] is the velocity of the block at rest which is [tex]u_1 = 0 \ m/s[/tex]
=> [tex]0.021 *1200 + 300 * 0 = 0.021 * 950 + 300 * v_1[/tex]
=> [tex]v_1 = 0.0175 \ m/s[/tex]
Generally the force is mathematically represented as
[tex]F = \frac{m_1 * v_1 }{t}[/tex]
=> [tex]F = \frac{300 * 0.0175 }{3.256 *10^{-4}}[/tex]
=> [tex]F = 16124 \ N[/tex]
• What are some examples of REPresentatives?
answer:
the house of representatives is an example of representatives!
explanation:
hope this helped <3 also if wouldn't mind could you pls give me brainliest? (im trying to level up) thanks! :)
8. What is one key physical difference between
transition metals and poor metals?
a. Atomic mass
b. Hardness
c. Reactivity
d. Charge
An object with a mass of 10kg accelerates 16 m/s2 when an unknown force is
applied to it. What is the amount of force?
160 N
9.8 m/s2
165.8 kg
1.6 N
Answer:
The answer is 160 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 10 × 16
We have the final answer as
160 NHope this helps you
What causes convection currents?
1. The Earth's rotation
2. The uneven heating of Earth's surface
3. The jet stream
4. The uneven cooling of Earth's surface
Answer:
not sure if this answer helps,
Explanation:
What is caused by the uneven heating of Earth and its atmosphere?
Global winds
This uneven heating produces global circulation patterns. For example, the abundance of energy reaching the equator produces hot humid air that rises high into the atmosphere. ... The air eventually stops rising and spreads north and south towards the Earth's poles.Solar heating of the Earth's surface is uneven because land heats faster than water, and this causes air to warm, expand and rise over land while it cools and sinks over the cooler water surfaces.
THANK YOU AND HAVE A GREAT NIGHT!
You hit someone with a force of 187 N.
How much force is exerted on you?
Answer in units of N.
Answer: 187 N
Explanation: I got it right on quest
Planets that are farther from the Sun orbit more slowly.
True or false?
Answer:
True :))))))))))))))))))))))))))))))))
To observe a chemical property, a chemical change must occur (new substances produced). To see if a piece of paper has the chemical property of combustability (will burn in oxygen), you must actually try to burn it, producing carbon (ash), water vapor, carbon dioxide – the material is no longer paper. What are some clues, observations that might indicate that a chemical change has occurred?
Answer:
Explanation:
Chemical reaction is described as the process of rearrangement of the atoms to produce a new product which will have a different chemical identity.
For the observatory evidences to prove a chemical reaction has occurred we can look to the following:
Emission of heat/loss of heatEmission of lightchange in the physical formFormation of precipitateEvolution of gasescolor changeDecomposition of the organic matterGenerally chemical change is irreversibleAbsolute result for the chemical change can be observed using the chemical analysis
A Penny is dropped and falls freely from the top of the Empire State building 443m high. What information do you know? 1b. How long does it take to hit the ground? 1c. How fast is it moving right before it hits the ground?
Answer:
1b. 9.51 s
1c. 93.18 m/s.
Explanation:
1a. From the question given above, the following data were obtained:
Initial velocity (u) = 0 m/s
Height (h) = 443 m
Acceleration due to gravity (g) = 9.8 m/s²
1b. Determination of the time it takes for the penny to get to the ground.
Height (h) = 443 m
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) =?
h = ½gt²
443 = ½ × 9.8 × t²
443 = 4.9 × t²
Divide both side by 4.9
t² = 443/4.9
Take the square root of both side
t = √(443/4.9)
t = 9.51 s
1c. Determination of the speed of the penny before it hits the ground.
Initial velocity (u) = 0 m/s
Height (h) = 443 m
Acceleration due to gravity (g) = 9.8 m/s²
Final velocity (v) =.?
v² = u² + 2gh
v² = 0² + 2 × 9.8 × 443
v² = 0 + 8682.8
v² = 8682.8
Take the square root of both side
v = √8682.8
v = 93.18 m/s
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