A car of mass 1000 kg has its speed reduced from 81 km/h to 54 km/h by brakes producing a force of 1250 N. How long does this take? Determine the work done by the brakes on the car. Determine...

A car of mass 1000 kg has its speed reduced from 81 km/h to 54 km/h by brakes producing a force of 1250 N. How long does this take? Determine the work done by the brakes on the car. Determine...

Two charges of 10-6 C are located 1cm apart (a) What is the force on a charge +10-8 halfway between them? (b) What is the force on a charge of -10-8 C at the same place?

A 49kg bicycle rider delivers an average of 0.28 hp. The mass of the bicycle is 2.1kg and the hill she is climbing is 245m tall. How much time will this take?

A 1 kg model rocket is launched at a 30 degree angle from the floor. The small rocket burns for 5.00 s and has a steady thrust of 20.0 N. What maximum altitude does the rocket reach and range of the...

A particle of mass m = 10kg moves along a straight line under the action of force F = λ/x4 , where λ is some constant. A measurement shows that the particle passes the point x = 1m with...

Why is it easier to pull an object up an incline rather than pushing?

Which is larger, the normal force or the force of friction?

A 1.5 kg book is held against the wall by an applied force. The applied force is 60° above the horizontal. Given that the static coefficient of friction between the block and the wall of 0.65, determine: a)...

A string has a 3.5 kg block on one end and a 2.5 kg ball on the other. The system is suspended over a table, with the ball hanging down and the block resting on the table. Given that the table has...

A 2.5 kg ball is suspended over a table that is attached to a 3.5 kg block that is on the table. The friction coefficient of the table is 0.25 What is the initial acceleration of the...

A Student moves a box of books with a rope by pulling the rope with a force of 90 N at an angle of 30°. The books have a mass of 20 kg and a coefficient of friction between the box...

An astronaut has a mass of 80 kg, but on an unknown planet, the bathroom scale reads 15 kg when the astronaut stands on it. What is the astronaut's weight and the gravitational field strength on the...

A block of mass 7.33 kg lies on a frictionless horizontal surface. The block is connected by a cord passing over a pulley to another block of mass 2.45 kg which hangs in the air, as shown...

A skier of mass 87.8 kg comes down a slope of constant angle 44◦ with the horizontal. What is the force on the skier parallel to the slope? The acceleration of gravity is 9.8 m/s 2...

After some time of fleeing, Bob realizes it is almost his curfew time and that his mom will ground him if he is not back at home (Bob’s mom can be scarier than the police). Bob turns around...

I've been stuck on this question forever and I keep getting it wrong :( Please help! A truck of mass 3 tonnes is travelling at 105km/h when it hits a car of mass 1.5 tonne travelling...

A table lamp has a circular base of diameter 120 mm and a height of 300 mm. It stands on a rough horizontal surface. The Centre of mass of the table lamp is 60 mm above its table. Why the table lamp...

A 25 kg wooden crate is being pushed against a large spring with a spring constant of 1200 N/m. If the coefficient of friction between the crate and the ground is 0.68, how much does the spring...

A machine component of mass 14kg is constrained to move only in the direction of the slide as shown. It is subject to the force F= 350N as shown. Neglecting effects of static weight, calculate its...

After a 1.30 x 10^2kg astronaut (incl. equipment) connects a safety line (length = 22.0m) to herself and to the spacecraft (mass = 2.80 x 10^3kg), she pushes against the craft and moves away at a...