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A 45.0-kg crate is dragged at constant velocity 8.20-m across a horizontal floor with a rope making a 30 degree angle above the horizontal. The coefficient of kinetic friction is 0.250. Find the work done
a) by friction
b) by rope
sometimes a person cannot clearly see objects close up or far away. to correct this type of vision bifocals are often
A 20 g ball is fired horizontally with initial speed v_0 toward a 110 g ball that is hanging motionless from a 1.10 m-long string. The balls undergo a head-on, perfectly elastic collision, after which the 110 g ball swings out to a maximum angle t..
A large tank of water is full and has a depth of 10.0 m. What is the pressure at the bottom of the tank
A car weighing 12 kN is driving due north at 30.0 m/s. After driving around a sharp curve, the car is moving east at 30.0 m/s. What is the change in momentum
A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.66 of the person's regular weight. Calculate the acceleration of the elevator
As part of a carnival game, a 0.578-kg ball is thrown at a stack of 17.8-cm tall, 0.383-kg objects and hits with a perfectly horizontal velocity of 12.8 m/s. what is the moment of inertia of the object about its center of mass
a magnetic field increases from 0 to 0.30t in 1.5 seconds. how many turns of wire are needed in a circular coil 15cm in
A plane, diving with constant speed at an angle of 53.0° with the vertical, releases a projectile at an altitude of 750 m. The projectile hits the ground 7.00 s after release.
An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. obtain the magnitudes of the net force acting on electron
Engineers are designing a curved section of a highway. If the radius of curvature of the curve is 114 m, at what angle should the curve be banked
An aluminum calorimeter with a mass of 100 g contains 250 g of water. The calorimeter and water are in thermal equilibrium at 10°C. Determine the specific heat of the unknown sample
A.) What is the total negative charge, in coulombs, of all the electrons in a small 1.00 sphere of carbon? One mole of is 12.0 , and each atom contains 6.00and 6.00 electrons.
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