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Nikitich [7]
3 years ago
7

A box, compressing a spring by 4 m, is loaded and ready. Moments later the 8.0 kg box has been launched with

Physics
1 answer:
Mrac [35]3 years ago
3 0

Answer:

50 N/m

Explanation:

Elastic energy = kinetic energy

EE = KE

½ kx² = ½ mv²

½ k (4 m)² = ½ (8.0 kg) (10.0 m/s)²

k = 50 N/m

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Which object has the greatest
Lyrx [107]

Answer:

H-a seated high school student

Explanation:

"Inertia" is an important word in Physics. It is the resistance of an object to any change in motion. Measuring the amount of inertia largely relies on the "mass of an object." The heavier the object, the more likely it is able to resist any change in motion.

Among the choices above, the high school student is the heaviest and has greater mass than the leaf, softball or balloon. This means, <u>it has the greatest inertia.</u>

Thus, this explains the answer.

3 0
4 years ago
A coin is dropped from a height of 188 meters. Neglecting air resistance, how much time (in seconds) was the coin in the air?
Marina CMI [18]

Answer:

t=6.19s

Explanation:

With a initial velocity is zero, kinematics equation is:

y=1/2*g*t^2

t=\sqrt{2y/g}=\sqrt{2*188/9.81}=6.19s

8 0
3 years ago
Consider a rocket that is in deep space and at rest relative to an inertial reference frame. The rocket's engine is to be fired
ValentinkaMS [17]

Answer:

\frac{m_i}{m_f}=2.7182

\frac{m_i}{m_f}=1096.633

Explanation:

m_i = Initial mass of rocket

m_f = Final mass of rocket

u = Initial velocity

v_r = Relative velocity

v = Velocity

From the rocket equation

v=u+v_{r}\ln {\frac {m_{i}}{m_{f}}}\\\Rightarrow v=v_{r}\ln {\frac {m_{i}}{m_{f}}}\\\Rightarrow \frac{m_i}{m_f}=e^{\frac{v}{v_{r}}}\\\Rightarrow \frac{m_i}{m_f}=e^{\frac{v}{v}}=e^1\\\Rightarrow \frac{m_i}{m_f}=2.7182

\frac{m_i}{m_f}=2.7182

when v=7v_r

v=v_{r}\ln {\frac {m_{i}}{m_{f}}}\\\Rightarrow \frac{m_i}{m_f}=e^{\frac{v}{v_{r}}}\\\Rightarrow \frac{m_i}{m_f}=e^{\frac{7v_r}{v_r}}=e^7\\\Rightarrow \frac{m_i}{m_f}=1096.633

\frac{m_i}{m_f}=1096.633

6 0
3 years ago
So long as there are(is) ______ there is no movement.
patriot [66]

Answer:

answer is friction. MCQ A is answer

6 0
3 years ago
Why don't we feel pressure exerted by atmosphere?
ozzi
Crushing pressure. Human bodies are used to air pressure. The air pressure in our lungs, ears and stomachs is the same as the air pressure outside of our bodies, which ensures that we don't get crushed. Our bodies are also flexible enough to cope when the internal and external pressures aren't exactly the same.
6 0
4 years ago
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