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Find an expression for the electric field strength outside the sphere, r> R.
A ball is projected upward at time = 0.0 s, from a point on a roof 50 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is Consider all quantit
Please calculate the percent of Earth's gravitational force on the Shuttle astronauts while orbiting at an altitude of 248 miles (or 399 km) above Earth's surface. To do this, compare the gravitati
The cart is released from rest, allowing it to roll, pulled by the falling hanger. What is the formula for the acceleration a of the cart in terms of the cart's mass M, the hanger's mass m, and the
A pitcher throws a curveball that reaches the catcher in 0.59 s. The ball curves because it is spinning at an average angular velocity of 380 rev/min (assumed constant) on its way to the catcher's
A 0.570-kg ball is dropped from rest at a point 4.40 m above the floor. The ball rebounds straight upward to a height of 3.20 m. Taking the negative direction to be downward, what is the impulse of
The magnitude of F is 306 newtons and it points at 93o measured counterclockwise from the positive x-axis. What is the y component (in newtons) of F?
A parachutist with a camera, both descending at a speed of 11 m/s, releases that camera at an altitude of 140 m. What is the velocity of the camera just before it hits the ground?
What is the rate of energy transfer by radiation from a metal cube 2.1 on a side that is at 750? Its emissivity is 0.40.
The springs of a 1000 kg car compress 6.5 mm when its 68 kg driver gets into the driver's seat. If the car goes over a bump, what will be the frequency of vibrations?
A rope having a total mass of 0.4 kg and total length of 4 m has a 0.6 m of the rope hanging vertically down off a work bench. How much work must be done to place all the rope on the bench?
A firm wants to determine the amount of frictional torque in their current line of grindstones, so they can redesign them to be more energy efficient.
A superhero flies 305 m from the top of a tall building at an angle of 33? below the horizontal. What is the horizontal component of the superhero's displacement?
A 0.570 kg ball is dropped from rest at a point 1.50 m above the floor. The ball rebounds straight upward to a height of 0.800 m. What are the magnitude and direction of the impulse of the net force
After a day of testing race cars, you decide to take your own 1430 kg car onto the test track. While moving down the track at 10.0 m/s, you uniformly accelerate to 32.0 m/s in 10 s. What is the aver
One mole of Ar initially at 325 K undergoes an adiabatic expansion against a pressure P external = 0 from a volume of 10.5 L to a volume of 92.0 L. Calculate the final temperature using the ideal ga
What is the total magnetic flux through the surface? Choose directions for the area vectors so that the flux through each surface is positive.
An 7.0 m, 240 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.55, and the ladder makes a 50.0° angle with the ground. How
A 4.00-kg cylinder of solid iron is supported by a string while submerged in water. What is the tension in the string? (The specific gravity of iron is 7.86.)
Calculate the magnitude of the repulsive force between a pair of like charges, each of one micro-coulomb, separated by a distance of one centimeter?
A ceiling fan with 82cm diameter blades is turning at 70rpm. Suppose the fan coasts to a stop 29s after being turned off. 1. What is the speed of the tip of a blade 10s after the fan is turned off?
A charge of +1 Coulomb is place at the 0-cm mark of a meter stick. A charge of -1 Coulomb is placed at the 100-cm mark of the same meter stick. Is it possible to place a proton somewhere on the met
When a 58 gram tennis ball is served, it accelerates from rest o a constant speed of 45 meters per second. the impact of the racket gives the ball a constant acceleration of 46 cm. what is the magn
Five thousand joules of heat is put into a Carnot engine whose hot and cold reservoirs have temperatures of 480 and 270 K, respectively. How much heat is converted into work?
An engine has a hot reservoir temperature of 915 K and a cold reservoir temperature of 650 K. The engine operates at three-fifths maximum efficiency. What is the efficiency of the engine?