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Q. When you push a 1.95kg book resting on a tabletop it takes 2.50N to start the book sliding. Once it is sliding, though, it takes only 1.50N to keep the book moving with constant speed. What are the coefficients of static and kinetic friction between book and tabletop?
Q. Iron has a density of 7.870 g/cm3, and the mass of an iron atom is 9.27 × 10-26 kg. If the atoms are spherical and tightly packed, (1) what is the volume of an iron atom and (2) what is the distance between the centres of adjacent atoms?
A 2,700-kg satellite is in a circular orbit around a planet. The satellite travels with a constant speed of 6,270 m/s. The radius of the circular orbit is 8.72 × 10^6 m. What is the acceleration of satellite.
On another planet the simple pendulum consisting of a 0.154 kg mass suspended on a 1.20 m long string has a period of 3.860 seconds. What is acceleration on this planet.
The path of an electron, travelling at 3.7 × 104 meters/second, is making the right angle to a magnetic field. A single electron experiences a force of 2.2 × 10-15 Newton's while in the field. What is strength of the magnetic field .
A certain type of laser emits light that has a frequency of 5.2 x 10^14 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 2.7 x 10-11 s. How many wavelengths are there in one pulse.
What is the apparent weight of a 75 kg astronaut.
A highway curve of radius 500 m is designed for traffic moving at a speed of 73 km/hr. What is the correct banking angle of the road.
A father (m = 90 kg) and son (m = 45 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3 m/s after they have separated. How fast is the father moving.
A solid cylinder of mass 3 kg and radius 0.2 m starts from rest at the top of a ramp, inclined 15°, and rolls to the bottom without slipping. (For a cylinder I = 0.5MR2) The upper end of the ramp is 1.2 m higher than lower end. Find the linear sp..
A 48.21 {rm kg} ice skater spins about the vertical axis through her body with her arms horizontally outstretched, making 2.20 turns each second. The distance from one hand to the other is 1.5 {rm m}. Biometric measurements indicate that each hand na..
Chef at the infamous Fattening Tower of Pizza tosses the spinning disk of uncooked pizza dough into the air. The disk's diameter increases during the flight, whereas its rotational speed.
A young woman buys a sports car that can accelerate at the rate of 5.47m/s2. She decides to test the car by drag racing with another speedster, Stan Speedy. Both start from rest, but experienced Stan leaves the starting line 1.47s before Kathy. Stan ..
A 54.00 kg bungee jumper has fallen far enough that her bungee cord is beginning to stretch and resist her downward motion. Find out the force (magnitude and direction) exerted on her by the bungee cord at an instant while her downward acceleratio..
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