Mechanics | Relativity Answers

A model rocket fired from the ground
ascends with constant upward acceleration.
After 1.0 s from firing a small bolt is
dropped from the rocket and after 5.0 s from
firing, its fuel is then finished. The bolt
strikes the ground after 2.0 s from the instant
it was dropped. Acceleration due to gravity
is g = 10 m/s2
.
(a) acceleration of the rocket while running
on its fuel is 8.0 m/s2
.
(b) rocket was at height 100 m above the
ground when its fuel was finished.
(c) maximum speed of the rocket during its
flight is 40 m/s
(d) total airtime of the rocket is 15 s
THE QUESTION IS HOW MANY STATEMENTS ARE TRUE?
CAN U PLEASE EXPLAIN IN DETAIL

two blocks are free to slide along the frictionless, wooden track. The block of mass m1=5 kg is released from the position shown, at height h=5m above the flat part of the track. Protruding from its front end is the north pole of a strong magnet, which repels the north pole of an identical magnet embedded in the back end of the block of mass m2=0 kg, initially st rest. The two blocks never touch. Calculate the maximum height to which m2 rises after the elastic collision

A body is projected vertically upward. If t1 and t2 are the times at which the body is at height h above the point of projection while ascending and descending respectively. Then h=?

A bowling ball rolls 32 meters in 0.8 seconds. Find the average speed (in m/s) of the bowling ball in m/s.

Consider the two observers o and o at the origins of the frames of reference s and s respectively,which are in relative motion at constant velocity v along the x-axis as illustrated in figure TMA1 fig1 suppose the origins o and o as well as the axes of the coordinates of these frames are coincident at an initial time t=t=o.The two observers are equipped with measuring instruments to determined the coordinates of the event at p. measurements made in the s frame are related to those made in the s by the following except?
a)x=x-vt
b)y=y
c)t=t
d)z=z+vt

A bubble originating at the bottom of a lake rises to the surface within 10.0 seconds with an acceleration of 10.0 meters/second2. What is the depth of the lake?

100 meters

200 meters

300 meters

400 meters

500 meters

A bus starting from rest has uniform acceleration of 5m/sec^2 simultaneously moves along the same road with constant velocity of 50m/sec. what the car and bus meet the velocity of the bus is?

a car travelling with a speed of 60km/hr brakes and comes to rest within a distance of 20m. if the speed of the car were 120km/hr, the stopping distance will be?

a steel cable by which an elevator of mass 800kg is suspended has a diameter of 2cm.the unstretched length of the suspension cable is 10m when the elevator is on the top floor of the building.the first floor is 50m below the top floor.find the values of extension in the cable when the elevator is on the top and on the first floor.

A proton is held motionless between two horizontal metal plates 10 cm apart. What voltage should be applied between the plates?