Mechanics | Relativity Answers

A 1590 kg car moving south at 13.5 m/s collides with a 2540 kg car moving north. The
cars stick together and move as a unit after
the collision at a velocity of 5.90 m/s to the
north.
Find the velocity of the 2540 kg car before
the collision.
Answer in units of m/s

Conservations of linear momentum applied whether kinetic energy is conserved or not. Explain whether the conservation of kinetic energy in a given collision process atomaticaly implies that linear momentum is conserved in that process.

At t = 0, one toy car is set rolling on a straight track with initial position 14.5 cm, initial velocity -2.5 cm/s, and constant acceleration 2.70 cm/s2. At the same moment, another toy car is set rolling on an adjacent track with initial position 11.0 cm, initial velocity 5.00 cm/s, and constant zero acceleration.
(a) At what time, if any, do the two cars have equal speeds? (Enter NA if the cars never have equal speeds.)
1 s

(b) What are their speeds at that time? (Enter NA if the cars never have equal speeds.)
2 cm/s

(c) At what time(s), if any, do the cars pass each other? (If there is only one time, enter NA in the second blank. If there are two times, enter the smaller time first. If they never pass, enter NA in both blanks.)
3 s
4 s

(d) What are their locations at that time? (If there is only one position, enter NA in the second blank. If there are two positions, enter the smaller position first. If they never pass, enter NA in both blanks.)
5 cm
6 cm


(e) Explain the difference between ques

A point within 5 cm of electric current carrying wire has a large magnetic field of 10 Tesla. What is the magnetic field of a point within 16 cm of the electric current carrying wire ....

calculate the moment of a uniform solid cone about an axis through its centre. the cone has mass M and altitude h, the radius of circular base is R ?

a stone of mass 0.2 kg projected vertically upwards with a velocity of 25 ms calucate the maximum height reached by it above the ground.at what height will it lose 20% of its initial kinetic energy ?

the acceleration of moon with respect to earth is 0.0027m/s2 and the acceleration of an apple falling on earth surface is about 10m/s2. assume that the radius of the moon is one fourth of the earth's radius .if the moon is stopped for an instant an then released , it will fall towards the earth .
1.what is the initial acceleration of the moon towards the earth
2.the acceleration of the moon just before it strikes the earth?

An object is thrown vertically upwards, rises to a maximum height and eventually returns to its original displacement, subject to negligible air resistance. describe the following, while the body is in the air:
1. the speed
2. the velocity
3. the resultant force
4. the acceleration

The kinetic energy of a cougar that was moving at a speed of 35km/h was determined to be 4000J. What was the mass of the cougar?

By trial and error, a frog learns that it can leap a maximum horizontal distance of 1.5 m. If, in the course of an hour, the frog spends 33% of the time resting and 67% of the time performing identical jumps of that maximum length, in a straight line, what is the distance traveled by the frog?