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Suppose the roller coaster (h1 = 31 m, h2 = 13 m, h3 = 25) passes point A with a speed of 1.00 m/s. If the average force of friction is equal to one third of its weight, with what speed will it rea
A baseball pitcher throws a fastball at a speed of 43 m/s. The acceleration occurs as the pitcher holds the ball in his hand and moves it through an almost straight-line distance of 3.9 m. Calculat
A television set connected to a 120 V outlet consumes 75 W of power. How much current flows through the television? How long does it take for 10 million electrons to pass through the television?
A bucket of water with a mass of 2.0 kg is attached to a rope that is wound around a cylinder. The cylinder has a mass of 3.0 kg and is mounted horizontally on frictionless hearings. The bucket is
When a 58 g tennis ball is served, it accelerates from rest to a constant speed of 45 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 47 cm. What is the ma
You have 246 mL chlorine trifluoride gas at 686 mmHg and 27°C. What is the mass (in g) of the sample?
If the bullet-block system compresses the spring by a maximum of 82.0 cm, what was the speed of the bullet at impact with the block?"
If a car is traveling north at 88km/h and then turns east while continuing to move at 88km/h, what changes the velocity or the speed?
Assume that the air in the bubble is always in thermal equilibrium with the surrounding water, and assume that there is no exchange of molecules between the bubble and the surrounding water. What is
how many millilitres of 1.09 M HCl are required to react with a solution formed by dissolving 0.775 grams of sodium carbonate?
An engineer wishes to mount an axle on a gear (modeled as a solid disk of mass M and radius R). At what distance from the center of the gear should he mount the axle?
Find the direction of the force at the support point. Find the magnitude of the force at the left-hand end. Find the direction of the force at the left-hand end.
A projectile is fired staright upward at 141m/s. How fast is it moving at the instant it reaches the top of trajectory? How long does it take the projectile to reach the top of its trajectory? How
A 62-kg person on skis starts from rest down a hill sloped at 40° from the horizontal. The coefficient of friction between the skis and the snow is 0.10. After the skier had been moving for 5.0
Find the rocket's final speed assuming it moves straight upward near the surface of Earth where the gravitational field g is constant.
A candle is placed 15.0 cm in front of a convex mirror. When the convex mirror is replaced with a plane mirror, the image moves 8.5 cm farther away from the mirror. Find the focal length of the conv
Automobile engine slows down from 4500rpm to 1200rpm in 2.5 s. Calculate (a) its angular acceleration, assumed constant, and (b) the total number of revolutions the engine makes in this time.
How many grams of NaCl are needed to prepare 250. mL of this solution (assume the density of the saline solution is 1.0 g/mL)?
If an rac man uses a long handled wheel brace (1.5m long) to help him remove a wheel nut off a lorry and he pulls on the handle with a force of 400n, what is the size of the moment produced? includ
A child exerts a tangential 41.0 {N} force on the rim of a disk-shaped merry-go-round with a radius of 2.00 {m}.If the merry-go-round starts at rest and acquires an angular speed of 0.0900 {rev/s} i
Assume the positive x axis is directed to the right. Find the magnitude and direction of the net displacement of the player using the graphical method.
The boxes are in contact, and a force of 60.0 N is applied horizontally to the smaller box. what is the acceleration of the two boxes?
Sam, whose mass is 80.0 , takes off down a 51.0 high, 9.0 slope on his jet-powered skis. The skis have a thrust of 220 . Sam's speed at the bottom is 45.0 . what is the coefficient of kinetic frict
The loaded cab of an elevator has a mass of 1.7 x 103 kg and moves 201 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab?
A 1.0m diameter vat of liquid is 2m deep. There pressure at the bottom of the vat is is 1.3atm. What is the mass of the liquid in the vat?