Classical Mechanics Answers

Dindy of mass 48 kg wears heels with an area of 2 cm² in contact with ground. Calculate the

pressure exerted by the girl on the ground.

What is the mass of a lead sphere whose diameter is 0.50 m given density of steel is 7800 kg/m3 ?

A 75 kg man is riding an escalator in a shopping mall.The escalator moves the man at a constant velocity from ground floor level to the floor above,a vertical height of 4.60m.What is work done by a,the gravitational force and b,by the escalator

A child is dragging a small crate across the horizontal floor as shown in the figure above. She is dragging the crate using a string such that the tension force in the string is 20 N.

If the crate has a mass of 9.2 kg and is accelerating at a rate of 0.55 m s⁻² then what is the magnitude of the friction force on the crate from the floor? (to 2 s.f)

Under which of the following conditions is the magnitude of the average velocity of a particle moving in one dimension smaller than the average speed over some time interval? (a) A particle moves in the % x direction without reversing. (b) A particle moves in the # x direction without reversing. (c) A particle moves in the % x direction and then reverses the direction of its motion. (d) There are no conditions for which this is true.

a particle falling under gravity is subject to a retarding force proportional to its velocity.find its position of time , if its starts from rest , and show that it will eventually reach a terminal velocity

A 12 kg crate slides down a slope as shown in the figure above. The crate starts at rest at the top of the slope and by the time it reaches the bottom it is traveling at a speed of 5.1 m s⁻¹.

What is the magnitude of the frictional force f acting on the crate as it slides down the slope? (in N to 2 s.f)

What is the angular velocity of the hour hand of a clock if it has a length L

and mass m?

You're travelling in a straight line. With a constant acceleration of 0.50 \text{ m}\cdot{s}^{-2}

0.50 m⋅s−2

, how long does it take to accelerate from 13 \text{ m}\cdot \text{s}^{-1}

13 m⋅s−1

to 18 \text{ m}\cdot \text{s}^{-1}

18 m⋅s−1

, and how far do you travel while doing so?

Time = _____ seconds

Distance = ______ metres.

A grandfather clock on earth has a pendulum with a period of 1.0. Calculate the length of the pendulum