Mechanics | Relativity Answers

An object moves with constant acceleration 4.15 m/s2 and over a time interval reaches a final velocity of 10.4 m/s.
(a) If its original velocity is 5.20 m/s, what is its displacement during the time interval?
m

(b) What is the distance it travels during this interval?


(c) If its initial velocity is
−5.20 m/s,
what is its displacement during this interval?


(d) What is the total distance it travels during the interval in part (c)?

A man of mass m=6-kg is standing on the floor of an elevator which is connected to a light pulley system. the mass of the elevator is 30 kg . the friction between the rope and the pulley can be neglected. find the force acted by the man on the floor of the elevator when the elevator is descending with uniform speed ?

The father of a 20kg child stands at the summit of a conical hill as he spins a 2.0m long rope.the sides of the hill are inclined at 20 degrees.he again keeps the rope parallel to the ground and friction is negligible.what rope tension will allow the cart to spin the same 14rpm it had?

The Father of a 20 kg child stands at the summit of a conical hill as he spins a 2.0m long rope

An object is thrown horizontally with a velocity of 10 m/s from the top of a 20-m high building. Where does the object strike the ground?

A 500g rubber ball is dropped from a height of 10 m and undergoes a perfectly elastic collision with the earth.

A) What is the earth's velocity after the collision? Assume the earth was at the rest just before collision.

B)How many years would it take the earth to move 1.00 mm at this speed?

Determine the appropriate coefficient of friction in each case. show all you solutions.

1.It takes 59 N of horizontal force to get a 22 kg leather suitcase just starting to move across a floor. find us (hint fn=fg=mg)

2. A horizontal force of 54 N keeps the suitcase in moving at a constant velocity. find uk (hint fn=fg=mg)

Sally travels by car from one city to another. She drives for 21.0 min at 76.0 km/h, 53.0 min at 40.0 km/h, and 49.0 min at 49.0 km/h, and she spends 6.0 min eating lunch and buying gas. Determine the average speed for the trip.

In Searle’s apparatus for measurement of Young’s modulus, a steel wire of length 2m and
area of cross-section 6 2 2.5 10^-6 m^2 − × is suspended from a torsion head. When a weight of
5 kg is suspended at its free-end, its length increases. Calculate the work done on the
wire. Take Young’s modulus of steel as 2 10^11 Nm .

if water is falling from a nul drop after drop. 1st drop has fallen on ground while 3rd drop is near to fall while 2nd drop is between somewhere distance between 1st and 3rd drop is 5 meter. What is distance between 2nd and 3rd drop?