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A shopper in a supermarket pushes a loaded 31 kg cart with a horizontal force of 12 N. The acceleration of gravity is 9.81 m/s2 . a) Disregarding friction, how far will the cart move in 4.2 s, start
A stone is dropped into a deep canyon and is heard to strike the bottom 4.48 s after release. How deep is the canyon? The speed of sound waves in air is 343 m/s and the acceleration of gravity is 9.8
How long, in seconds, does it take an automobile traveling 55.0 km/h to become even with a car that is traveling in another lane at 40.0 km/h if the cars' front bumpers are initially 130 m apart?
If the mass of the block is too large and the block is too close to the left end of the bar. What is the smallest possible value of x such that the bar remains stable (call it x_critical)?
A rifle bullet with a mass of 12.5 g traveling toward the right at 222 m/s strikes a large bag of sand and penetrates it to a depth of 21.3 cm. Determine the magnitude and direction of the friction
A good baseball pitcher can throw a baseball toward home plate at 85 miles per hour with a spin of 1800 revolutions per minute. How many rotations does it make on a path of 60 feet?
The block is spun at 50.0 rpm, then the temperature of the rod is slowly increased. When the wax melts, the block slides out to the end of the rod. What is the final angular velocity? Give your answ
A 1900 kg car starts from rest and drives around a flat 59 meter diameter circular track. The forward force provided by the car's drive wheels is a constant 1300 N.
(a) What are the forces acting on the top and on the bottom of the block? (Take P0 = 1.013 0 X 105 N/m2.) (b) What is the reading of the spring scale? (c) Show that the buoyant force equals the diff
Determine the range of speeds the car can have without slipping up down the road. Find the minimum value for f such that the minimum speed zero.
Four particles with masses 2 kg, 6 kg, 2 kg, and 4 kg are connected by rigid rods of negligible mass as shown. Assume the system rotates in the yz plane about the x axis with an angular speed of 2 r
The collar A slides on a smooth horizontal bar. the spring constant k = 40 lb/ft. the weights are Wa = 30 lb and Wb = 60 lb. At the instant shown, the spring is unstretched and B is moving downward
A rectangular container measuring 22 cm multiplied by 48 cm multiplied by 72 cm is filled with water. What is the mass of this volume of water in kilograms and grams?
A toy train is pushed forward and released at x_0=2.0m with a speed of 2.0m/s. It rolls at a steady speed for 2.0s, then one wheel begins to stick. The train comes to a stop 6.0m from the point at
At time t=0 a grinding wheel has an angular velocity of 22.0 rad/s. It has a constant angular acceleration of 34.0 rad/s^2 until a circuit breaker trips at time t = 1.50 s. From then on, the wheel t
Three particles are placed in a line. The left particle has a charge of -67 X 10^-6 C, the middle, 45 X 10^-6 C. Find the net force on the middle particle.
A professor's office door is 0.85 wide, 2.0 high, and 4.0 thick; has a mass of 25 ; and pivots on frictionless hinges. A "door closer" is attached to the door and the top of the door frame.
Suppose a heat engine takes in 420 J of energy from a hot reservoir and performs 30 J of work in each cycle. Find the efficiency of the engine.
Calculate the energy lost by photons Compton scattered at 45°, 90° and 135° for incident photons of energies 50 keV and 100 keV.
A 3.0-m-long rigid beam with a mass 150 {rm kg} is supported at each end. An 70 {rm kg} student stands 2.0 {rm m} from support 1. How much upward force does support 1 exert on the beam?
A jet is circling an airport control tower at a distance of 21.0 km. An observer in the tower watches the jet cross in front of the moon. As seen from the tower, the moon subtends an angle of 8.88
When rearranging a dorm room, a student does 292 J of work in moving a desk in moving a desk 3.2 m. What was the magnitude of the applied horizontal force
The driver sees a speed limit sign approaching and applies the brakes to decelerate to a speed of 48 km h-1. Given that the deceleration is 2.68 m s-1 find the distance over which the brakes are app
A man in search of his dog drives first 10 mi northeast, then 54 mi straight south, and finally 6 mi in a direction 30° north of west. What are the magnitude and direction of his resultant disp
A hoop of a radius of .5 m and mass of .2 kg is released from rest and allowed to roll down an inclined plane. how fast is it moving after dropping through a vertical distance of 3m.