Mechanics | Relativity Answers

A farm truck moves due east with a constant velocity of 10.00 m/s on a limitless horizontal stretch of road. A boy riding on the back of the truck throws a can of soda upward (see figure) and catches the projectile at the same location on the truck bed, but 20.0 m farther down the road.
(a) In the frame of reference of the truck, at what angle to the vertical does the boy throw the can?(b) What is the initial speed of the can relative to the truck?(in m/s)(e) In this observer's frame of reference, determine the initial velocity of the can.(magnitude and direction in degree above horizontal)

notice a water ballon fall past your classroom window. You estimate that it took the balloon about t seconds to fall the length of the window and that the window is about y meters high. Suppose the balloon started from rest. Approximately how high above the top of the window was it released?

Suppose the position vector for a particle is given as a function of time by
r
(t) = x(t)î + y(t)ĵ, with x(t) = at + b and y(t) = ct2 + d, where a = 2.00 m/s, b = 1.40 m, c = 0.129 m/s2, and d = 1.12 m.
(a) Calculate the average velocity during the time interval from t = 2.20 s to t = 4.05 s.
v
= m/s

(b) Determine the velocity at t = 2.20 s.
v
= m/s

Determine the speed at t = 2.20 s.
m/s

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. The athlete is able to rotate the ball at the rate of 8.06 rev/s when the length of the chain is 0.600 m. When he increases the length to 0.900 m, he is able to rotate the ball only 6.01 rev/s.
(a) Which rate of rotation gives the greater speed for the ball?
6.01 rev/s or
8.06 rev/s

(b) What is the centripetal acceleration of the ball at 8.06 rev/s?
m/s2

(c) What is the centripetal acceleration at 6.01 rev/s?
m/s2

A ball is thrown upward from the ground. You observe the ball through a window on its way up, and notice that it was visible for 1.8 seconds while it travels from the bottom of the window to the top, which is a length of 40.9122 metres.

How much time does it take for the ball to be seen again, in seconds?
How far above the top of the window will the ball reach, in metres?

A diver of mass 65kg takes off from the 10m platform from a standing position by jumping upwards with a vertical spread of 2.0m/s .Calculate
-time taken to reach the water
-gravitational potential energy
-kinetic energy

When you overstress a steel bar, what is the point called where it does not return to its original form?.
Option A. Plastic limit.
Option B. Elasticity limit.
Option C. Deformation limit.

80 kg person walking upstairs 12 steps. Each steps 100mm is height. What will be the work done