Mechanics | Relativity Answers

If car (a) traveling at 10 km/hr comes to a complete stop instantly after running into a wall, and car (b) also traveling at 10 km/hr comes to a complete stop instantly after running into another car head on coming at 10 km/hr; will both (a) and (b) cars experience the same g forces?

Toss a ball upward with an initial speed of 10 m/s. Neglecting air resistance, the time it takes to reach its release point is about
(a) 4 s (b) 1 s (c) 3 s (d) 2 s

A force exerted on an object produces an acceleration. If the mass is reduced by one-third, the acceleration is increased by a factor of

A soccer player, kicking a soccer ball, gives the ball a velocity of +26.8m/s. The mass of the ball is 0.425kg, and the duration of the impact is 1.05x10^-3s.

a)If the ball is to have a greater velocity after being struck, should the contact time with the foot be shorter or longer? Explain your reasoning.

An unconstrained rifle of mass 5.00kg fires a 50.0g bullet at a speed of 300.0m/s with respect to the ground.

a) What is the initial momentum of the rifle-bullet system?
b)What is the recoil velocity of the rifle?

An unconstrained rifle of mass 5.00kg fires a 50.0g bullet at a speed of 300.0m/s with respect to the ground.

a) What is the initial momentum of the rifle-bullet system?
b)What is the recoil velocity of the rifle?

Omar kicks a ball from a level field, at an initial velocity of 29.4 m/s at an initial angle of 60 with respect to the horizontal. The ball is in its trajectory for a total time of 3 s before it hits the ground. What is the ball’s horizontal displacement, X?

A satellite is placed in a circular orbit around Jupiter. The altitude of the satellite above the surface of Jupiter is 775km. Jupiter has a mass of 1.90x10^27kg and a radius of 7.14x10^7m.

1.Determine the radius of motion of the satellite.

2.What force is providing the centripetal force necessary for the satellite to stay in orbit?

3.In what direction is the centripetal force always acting?

4.Using the equation for centripetal force, Fc= m(v/R), and the gravitational force, Fg=Gmm/R^2, derive the mathematical equation that allows you to calculate the orbital speed of the satellite.

5.Calculate the orbital speed of the satellite circling Jupiter using the equation derived in part 3. The value of G=6.67x10^-11N*m^2/kg^2.

A ball bearing of mass m=50.0g, is sitting on a vertical spring whose force constant is 120.0N/m. The initial position of the spring is at y=0m. The spring is compressed downward a distance x=0.200m. From the compressed position, how high will the ball bearing rise? How high does the ball bearing rise above the equilibrium position at y=0m?

mass particles of 1 kg each are placed along x axis at x=1, 4, 8,......till infinity then gravitation force on a particle of mass 3kg placed on origin is?