Answer:
Hydrogen
Explanation: hopefully.
An increase/decrease in which of the following variables would have the
greatest effect on the period of a simple pendulum?
We have no idea what those "following variables" are. You faded out right at the point where you were supposed to show them to us.
The period of a simple pendulum only depends on its length, and the acceleration of gravity in the place where the pendulum is swinging.
It's really tough to answer the question, because both of these things are in a fraction in the formula for the period . . . the length is the numerator, and the local acceleration of gravity is the denominator. So which one has a greater effect on the period really depends on what those numbers are before anything changes.
- A 300 kg box of supplies is dropped from a plane and has a parachute attached, if it accelerates down
at 2m/s? what resistive force does the parachute supply?
Answer:
2340 N
Explanation:
There are two forces on the box. Weight force pulling down and resistive force pushing up.
Sum of forces in the y direction:
∑F = ma
F − mg = ma
F = mg + ma
F = m (g + a)
F = (300 kg) (9.8 m/s² + (-2 m/s²))
F = 2340 N
PLEASE HELP!! ILL MARK BRAINLYEST!!
The Law of Conservation of Matter is a basic principle in studying chemical reactions.
True
False
Answer:it is false
Explanation:
a sample o aluminum is put in 10.5 mL of water. if the water rises to 13.5 mL when the aluminum is added, what is the density of the aluminum if it has a mass of 8.1 g
Answer:
The answer is 2.7 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
volume = final volume of water - initial volume of water
volume = 13.5 - 10.5 = 3 mL
From the question we have
[tex]density = \frac{8.1}{3} \\ [/tex]
We have the final answer as
2.7 g/mLHope this helps you
PLEASE HELP ASAP I AM GIVING 30 POINTS PLEASE HELP
a boy sleading down a hill accelerates
alt 1.40m/s? If he started from rest, in what
In what distance would he reach a speed.
of 7s?
Answer:
9.8
Explanation:
distance=vt
1.40*7=distance
Which process is most responsible for moving heat through the atmosphere?
Answer:
Convection
Explanation:
Heat transfer by movement of heated materials is called convection. Heat that radiates from the ground initiates convection cells in the atmosphere.
PLEASE HELP ME!
Which statement about nuclear reactions is NOT true?
a.
Nuclear power plants use fission of uranium.
b.
In fission, the total mass of the reactants equals the total mass of the products.
c.
In fission, nuclei are split, and in fusion, nuclei are combined.
d.
Energy as heat and light in the sun are generated by hydrogen fusion reactions.
Answer:
b. In fission, the total mass of the reactants equals the total mass of the products.
Explanation:
In a nuclear reaction, the total mass of the reactants does not equal to the total mass of the products.
This is because mass is converted to energy in a nuclear reaction.
It is true that nuclear power plants use fission. Uranium is the fuel in most reactors used to generate electricity. During nuclear fission, an unstable nucleus is split and in fusion, atoms are combined together. Heat and light is produced in the sun which are generated by hydrogen fusion reactions.430 N is applied to a 250 kg object. What is the acceleration?
Answer:
a= 1.72 m/sec/sec
Explanation:
F=ma , here force is given as 430N and mass as 250 kg so using the formula acceleration can be calculated as follows
∴F=ma
1 N= 1 kg m[tex]s^{-2}[/tex]
[tex]a=\frac{F}{m}[/tex]
[tex]a=\frac{430 kg m/sec/sec}{250 kg}[/tex]
a= 1.72 [tex]ms^{-2}[/tex]
we know we have exerted a force even when we have no work done
argue on this can the speed of light be compared to the exact speed if electricity
Answer:
XD
Explanation:
XV
The amount of oxygen in the reactants in 4 atoms. In the products, the oxygen is distributed to water and gas. Which coefficient would be placed in front of water and oxygen
Answer:
2 for water(H2O)
1 for oxygen (O2)
Explanation:
This question is describing the decomposition of hydrogen peroxide (H2O2). Hydrogen peroxide (H2O2), which is the reactant gets broken down into water (H2O) and oxygen gas (O2). The chemical equation is as follows:
2H2O2 ---> 2H2O + O2
As described in the question, the amount of oxygen in the reactants (H2O2) is 4 atoms. The products are water and oxygen gas. To ensure that the equation is balanced, we have to use coefficients.
- Coefficient 2 has been placed in front of the water molecule to balance the number of hydrogen atoms (4) and oxygen atoms (4).
- The coefficient in front of the Oxygen gas remains 1.
Answer:
d
Explanation:
I took the test on edunuity and checked it got it right
Tell me a model that scientist have revised? Explain how it was changed.
::
A rope has a density and thickness such that a 3.25-centimeter-long segment of it weighs 61.40 grams. There are 28.3495
grams in an ounce and 2.54 centimeters in an inch. How many ounces would a 19.45 inch length of the same rope weigh?
5.10 oz
b. 11.49 OZ
32.92 oz
53.90 OZ
a
C.
d.
Please select the best answer from the choices provided
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с
D
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Answer:
A 19.45-inch-long segment of the same rope would weigh 32.92 ounces.
Explanation:
You know that:
3.25 cm length of rope weighs 61.40 grams .There are 28.3495 grams in an ounce .There are 2.54 centimeters in an inch.The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other), knowing the values a, b and c and x being the unknown, we must apply the direct rule of three as follows:
a ⇒ b
c ⇒ x
So [tex]x=\frac{c*b}{a}[/tex]
To find the number of ounces a 19.45-inch length of the same string would weigh, you apply the following rules of three:
If there are 2.54 centimeters in 1 inch, how many centimeters are there in 19.45 inch?[tex]centimeters=\frac{19.45 inch*2.54 centimeters}{1 inch}[/tex]
centimeters=49.403
Now, if 3.25 centimeters long it weighs 61.40 grams, then 49.403 centimeters long, how many grams does it weigh?[tex]grams=\frac{49.403 centimeters*61.40 grams}{3.25 centimeters}[/tex]
grams= 933.34
Finally, if there are 28.3495 grams in 1 ounce, in 933.34 grams how many ounces are there?[tex]ounces=\frac{933.34 grams*1ounce}{28.3495 grams}[/tex]
ounces= 32.92
A 19.45-inch-long segment of the same rope would weigh 32.92 ounces.
Answer:
c
Explanation:
If a car moves with a constant acceleration, can you conclude that there are no forces acting on it?
Newton's First Law of
Motion
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)
El elevador hidráulico de un garaje funciona mediante una prensa hidráulica conectada a una toma de agua de la red urbana que llega a la máquina con una presión de 5x10 5 N/m 2 . Si el radio del émbolo es de 20 cm y el rendimiento es de un 90% ¿Cuál es el valor en toneladas de la carga que como máximo puede levantar el elevador.
Answer:
El elevador puede levantar 5.76 toneladas de carga máxima.
Explanation:
De acuerdo a la ley de Pascal:
[tex] p_{1} = p_{2} [/tex]
[tex] \frac{F_{1}}{A_{1}} = \frac{F_{2}}{A_{2}} [/tex] (1)
En donde:
F: es la fuerza
P: es la presión
A: es el área
Sabiend que p₁ = 5x10⁵ N/m², tenemos que F₂ es:
[tex] F_{2} = p_{1}A_{2} [/tex] (2)
El área del embolo viene dada por el área de una circunferencia:
[tex] A_{2} = \pi r^{2} [/tex] (3)
Introduciendo la ecuación (3) en la ecuación (2) tenemos:
[tex] F_{2} = p_{1}\pi r^{2} = 5 \cdot 10^{5} N/m^{2} \pi (0.20 m)^{2} = 62832 N [/tex]
Dado que el rendimiento es del 90%, la fuerza máxima es:
[tex] F_{2} = 62832 N*0.90 = 56549 N [/tex]
Ahora sabemos que la fuerza del elevador para levantar la carga máxima es 56549 N y para encontrar el valor de toneladas de la carga máxima que puede levantar el elevador, debemos encontar la fuerza necesaria para levantar 1 tonelada:
[tex] F = mg = 1000 kg*9.81 m/s^{2} = 9810 N [/tex]
Finalmente, si para levantar 1 tonelada se debe aplicar una fuerza de 9810 N, y la fuerza total es igual a 56549 N, el numero de toneladas que puede levantar el elevador es:
[tex] N = \frac{F_{2}* 1 ton}{F} = \frac{56549 N* 1 ton}{9810 N} = 5.76 ton [/tex]
Por lo tanto, el elevador puede levantar 5.76 toneladas de carga máxima.
Espero que te sea de utilidad!
An atom that does not have a net charge of zero is called an
Answer:
If an atom loses or gains electrons, it becomes an ion with a positive or negative charge. So an ion is a special case of an atom when it has a total charge that is not zero. Usually if someone is talking about an atom with a positive or negative total charge, they will call it an ion rather than just an atom
Explanation:
An object is moving to the left. In which direction would a force need to be exerted to make this object slow down?
Answer:
left
Explanation:
When a force is applied in the opposite direction of motion, it opposes the motion of the object, causing its speed to decrease.
What is force?A force is an influence in physics that can change the motion of an object. A force can cause a mass object to change its velocity, or accelerate.
Intuitively, force can be described as a push or a pull. A force is basically a vector quantity as it has both magnitude and direction.
The term "force" has a specific meaning in science. At this level, it is perfectly acceptable to refer to a force as a push or a pull.
Another object applies a force to another. The concept of a force is not restricted to living or non-living things.
To slow a moving object, apply force in the opposite direction to the direction of motion.
Thus, the force should be applied from left to slow down the object.
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An object is moving to the left. In which direction would a force need to be exerted to make this object stop?
Answer: going right cause both will pull at each other and slow it down
Explanation:
A 0.84-kg block sits on a lab table. The block accelerates to the right at a rate of 1.96 m/s/s There is a backwards force of 0.87 N. What is the force pulling the block forward?
Answer:
kkolkkkkkkkkkkkkkkkkkkissxfd
Science is the study of the natural world through blank and blank
Answer:
biology. hope this helps
What unit is used when calculating acceleration?
The seniors at Citrus Hill leave for GRAD NIGHT at Disneyland at 8 p.m. they travel 60.5 miles before the stop in Anaheim. Then they return back to Citrus Hill at 7 a.m. What was the average speed of the bus?
Answer:
76
Explanation:
The speed is 76 miles per hour your welcome!!
STATION 1 - Shake a large mass vertically and horizontally and describe the difference. What if you were on the space station?
Answer:vertical is harder
Explanation:
Because of gravity
What is the difference between EMS waves and mechanical waves? Select all that apply. * Mechanical wave require a medium to travel on. EMS waves do NOT require a medium to travel on. EMS waves do NOT require a medium to travel on but, they can use a medium to travel on.
Answer:
EMS waves require no material medium to travel
Explanation:
Here, we want to consider the difference between mechanical waves and EMS waves
When we talk of EMS waves, we mean electromagnetic radiation waves .
Example of EMS waves include radio waves , x-rays etc
These kind of waves require no material medium to travel and this is the main difference they have with mechanical waves
A student kicks a football vertically upwards, causing the football to reach a maximum height of 40.0m before falling back to the ground. Determine all unknowns and answer the following questions. Neglect drag and the initial height and horizontal motion of the football.
A) With what speed was the football kicked?
B) What was the football's total flight time?
Answer:
A. 28 m/s
B. 5.72 s
Explanation:
The following data were obtained from the question:
Maximum height (h) = 40 m
Acceleration due to gravity (g) = 9.8 m/s²
A. Determination of the initial velocity.
Maximum height (h) = 40 m
Acceleration due to gravity (g) = 9.8 m/s²
Velocity at maximum height (v) = 0 m/s
Initial velocity (u) =.?
v² = u² – 2gh (Ball is going against gravity)
0² = u² – (2 × 9.8 × 40)
0 = u² – 784
Collect like terms
0 + 784 = u²
784 = u²
Take the square root of both side
u = √784
u = 28 m/s
Thus, the ball was kicked with a velocity of 28 m/s
B. Determination of the time of flight.
We'll begin by calculating the time taken to reach the maximum height. This can be obtained as follow:
Velocity at maximum height (v) = 0 m/s
Initial velocity (u) = 28 m/s
Time taken to reach the maximum height (t) =?
v = u – gt (Ball is going against gravity)
0 = 28 – 9.8t
Rearrange
0 + 9.8t = 28
9.8t = 28
Divide both side by 9.8
t = 28/9.8
t = 2.86 s
Finally, we shall determine the the time of flight as follow:
Time taken to reach the maximum height (t) = 2.86 s
Time of flight (T) =?
T = 2t
T = 2 × 2.86
T = 5.72 s
Therefore, the time of flight for the ball is 5.72 s
Discuss the significance of the Tropic of Cancer, the Equator, and the
Tropic of Capricorn as they relate to the seasons.
Answer:
im a capricorn may i?
Explanation:
If the coefficient of sliding friction between a 25 kg crate and the floor is 0.45, how much force is required to move the crate at a constant velocity across the floor?
At constant velocity, the crate would be in equilibrium, so that Newton's second law tells us
p + (-f ) = 0
where p and f denote the magnitudes of the added pushing force and friction force, respectively.
The friction force is proportional to the normal force by a factor of µ, the coefficient of friction. There's no vertical movement going on, so Newton's second law says
n + (-w) = 0
where n and w are the magnitude of the normal force and the weight of the crate, respectively.
Compute n :
n = w = (25 kg) (9.80 m/s²) = 245 N
Use this and µ = 0.45 to compute f :
f = µ n = 0.45 (245 N) = 110.25 N
Solve for p :
p + (-110.25 N) = 0
p = 110.25 N ≈ 110 N
The force i.e required to move the crate at a constant velocity across the floor is 110 N.
At the same velocity, the crate should be in equilibrium, so as per Newton's second law, the following formula should be used:
p + (-f ) = 0
p means the magnitudes of the added pushing force
f means the friction force
Calculation of the force:
n = w = (25 kg) (9.80 m/s²) = 245 N
Now
force should be
= µ n
= 0.45 (245 N)
= 110.25 N
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How many peanut butter cups does Benny have if he has 2 times as many as Karen. Karen has 80 peanut butter cups.
Answer:
160 peanut butter cups
Explanation:
80 * 2 = 160
Answer:
160
Explanation:
if benny has 2x more than karen and karen has 80 you would multiply 80 by 2 to get 160. therefore benny has 160. hope that helps