Mechanics | Relativity Answers

[img]https://upload.cc/i1/2020/03/06/CsXpzH.jpg[/img]


where d8 is 4

A scale reads 272 N when a piece of brass is hanging from it. What does it read (in N) when it is lowered so that the brass is submerged in water?
N

A rocket blasts off from rest and attains a speed of 45 m/s in 15 sec. An astronaut has a mass of 57 kg. What is the astronaut's apparent weight during takeoff?

Calculate the height of a satellite from the surface of the earth if its period is 12 h. Compare this height with the radius of the earth.

An object has a constant acceleration a=4m/s². It's velocity is 1m/s at t=0, when it is at x=7m. How fast is it moving when it is at x=8m? At what time is this?

https://upload.cc/i1/2020/03/03/VmZEs6.jpg

the question above

https://upload.cc/i1/2020/03/03/UFc9i5.jpg

d8 is 4

Prove the solutions to this simple harmonic oscillation a=w^2x

A child pushes a 31-kg shopping cart by a force of 120 N in a supermarket at angle of 25 degrees above the horizontal. If the cart experiences a friction force of 50 N that acts simultaneously on it, calculate the magnitude of its horizontal acceleration.
Bonus: Calculate the normal force acting on the cart.

You are designing a pendulum clock to have a period of 4.7s. How long should the pendulum be?