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AURORKA [14]
3 years ago
7

You push your friend, whose mass is 54kg, down a hill so she can go sledding. Her acceleration is 3m/s2. Calculate the amount of

force you applied to your friend.

Physics
1 answer:
Alecsey [184]3 years ago
3 0

Answer:

18 newtons

Explanation:

Divide weight by speed

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Cherise sets identical magnetic carts on two tracks. At the end of each track is a blue magnet that cannot move. Cherise can mov
Colt1911 [192]

Answer:

it's d

Explanation:

7 0
2 years ago
A rocket is launched straight up from the earth's surface at a speed of 1.80×104 m/s .part awhat is its speed when it is very fa
balandron [24]
We can solve the problem by using the law of conservation of energy.

When the rocket starts its motion from the Earth surface, its mechanical energy is sum of kinetic energy and gravitational potential energy:
E_i = K_i + U_i =  \frac{1}{2} m v_i^2 + (- \frac{GM}{r} )
where
m is the rocket's mass
v_i = 1.8 \cdot 10^4 m/s is the rocket initial speed
G=6.67 \cdot 10^{-11} m^3 kg^{-1} s^{-2} is the gravitational constant
M=5.97 \cdot 10^{24} kg is the Earth's mass
r= 6.37 \cdot 10^6 m is the distance of the rocket from the Earth's center (so, it corresponds to the Earth's radius)

The mechanical energy of the rocket when it is very far from the Earth is just kinetic energy (because the gravitational potential at infinite distance from Earth is taken to be zero):
E_f = K_f =  \frac{1}{2} mv_f ^2
where v_f is the final speed of the rocket.

By equalizing the initial energy and the final energy, we can find the final velocity:
\frac{1}{2} mv_i ^2 -  \frac{GM}{r} = \frac{1}{2}m v_f^2
v_f =  \sqrt{v_i^2 -  \frac{GM}{r} } =1.41 \cdot 10^4 m/s
3 0
3 years ago
Read 2 more answers
Someone please help!
NISA [10]
Do you know what's this unit called? it may help figure out how to do it.
8 0
3 years ago
Que es un kilogramo fuerza.?
Kipish [7]
El kilogramo de fuerza, o kilopond, es una unidad de fuerza métrica gravitacional. Es igual a la magnitud de la fuerza ejercida sobre un kilogramo de masa en un campo gravitatorio de 9.80665 m / s².
7 0
3 years ago
WILL GIVE THAT CROWN THINGY!
frutty [35]
Conservation of energy explains that energy can only be transferred between different forms of energy
3 0
3 years ago
Read 2 more answers
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