Mechanics | Relativity Answers

a steel plate measures '3 x 5'. If the pressure is 30lb/in2, calculate the force on the plate.

Two 1.5 kg balls approach each other with the same speed of 3.0 m/s . What is the total momentum nof the system by before collision?

A 30kg girl is riding a 20kg bike with a velocity of 10/m/s due east. What is the total momentum of a girl and a bike together?

The force of resistance on an object moving through a fluid is proportional to the
square of its velocity. The initial velocity of an object of mass 1 kg moving through the
fluid is 40 ms−1
. After 5 s the velocity reduces to 20 ms−1
. Calculate its velocity after
10 s.

An artillery shell is fired with an initial velocity of 250 m/s at 50.0° above the horizontal. After a period of 40.0 seconds from firing, it explodes on a mountainside.



What is the y- coordinate of the impact site relative to the firing point?

If a pendulum is suspended from a car moving along a plane of angle δ with horizon and car moves with acceleration a, then what is the time period for that pendulum?

Every 10 minutes one motor car starts from A towards B. The distance between A and B is 60 km. The speed of the motor car is 60 km/hr. The number of cars met by a passenger riding in a car which starts from B to A simultaneously with one of the motor cars from A will be ______. (The car in which the passenger is also travels at 60 km/hr)

How can I solve a lagrange equation when the kinatic energy is not the function of the velocity? i.e. E_k = k*x

A cyclist enters a curve of 30 m radius at a speed of 12 m s-1. He applies the
brakes and decreases his speed at a constant rate of 0.5 m s-2. Calculate the
cyclist’s centripetal (radial) and tangential accelerations when he is travelling at a speed of 10 m s-1.

During a throw an athlete exerts a net average torque of 100 Nm on a discus
about its axis of spin. The mass of the discus is 2 kg and its radius of gyration
about its spin axis is 12 cm. If the discus was not spinning at the beginning of
the throw and the throwing action lasts for 0.2 s, calculate how fast (in
radians s-1) the discus is spinning when it is released.