Mechanics | Relativity Answers

Calculate size of force on rectangular surface which measures 5 cm by 10cm if the pressure exerted on this surface is 200Pa.

a mocrometer screw gauge was used to measure the diameter of ball bearing. three measurements were found as follows;5.26mm,5.21mm,5.24mm. calculate the absolute error in the sum of these values

how do i do this question: you throw a ball up with a velocity of 10m/s from the top of the school.the top of the school is 12m high and you release it 1m above the hight of the roof. how long would it take to hit the ground?

You hold a rock at a height 10 m above the ground and throw it downwards. Its total energy at the top is 200 J, but by the time it has reached the ground, friction and air resistance has removed 136 J. How much is its energy just before it hits the ground? What is the rock's speed just before it hits the ground? Assume its mass is 2.0 kg.

A box weighing 66 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end.Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs each of the following.
(a) 21 N
(b) 58 N
(c) 93 N

A uniform rope of length L and mass M is held at one end and whirled in a horizontal circle with angular velocity 'w'.Find the time required for a transverse wave to travel from one end of the rope to the other

A 60.0-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.760 and 0.410, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?

You are on the roof of a building that is 150 m tall armed with a tennis ball launcher that fires tennis balls with a speed of 35 m/s. Another building is 100 m away from your building. You are trying to fire a tennis ball into a window of the other building that is 10 m below your current height. Knowing that the ball will fall as it travels you first align the launcher so that it is completely horizontal, hoping that fall the necessary 10 m as it reaches the building
a)how long does it take for the ball to reach the building?
b)Does the ball go through the window?If not where does the ball hit the building?
c)If you want the ball to go through the window at what angles could you aim the launcher?
d)For each angle in (c) find the time for the ball to reach the window
e) Sketch the two trajectories that the ball could take to go through the window.Explain why the times you found in (d) are different?

A particle of mass m is accelerated along the positive x-direction by a constant force; It starts from rest at the origin of an inertial frame. A second reference frame moves with constant speed V0 along the negative x-direction ; initially, the frame coincide

a) FInd the velocity and position of the particles as a function of time in both reference frames
b) Find the work done by the force during a time interval t in both frames

a 4kg block extends a spring by 16cm.The block is removed and the body of mass 0.5kg is hung from the same spring.if the body is then pulled slightly downwards and released find the period of resulting oscillatory motion.