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Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the United States in one year is about 9.33 x 109 J.
An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?
A quantity of water is poured into a graduated cylinder, which then reads 129 mL. What is the mass of the water in kilograms?
A 5.00 capacitor is initially charged to a potential of 16.0 . It is then connected in series with a 3.75 inductor. What is the maximum current in the inductor?
A ball of mass 0.340 kg moving east (+x direction) with a speed of 3.00 m/s collides head-on with a 0.520 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction
A coal-fired electric power plant has an overall efficiency of 35% and an output of 1,496 megawatts. How many terajoules (trillions of joules) of waste heat does it reject to the environment each da
An object which has a height of 12.5 cm is placed 45.0 cm in front of a concave spherical mirror which has a focal length of 15.0 cm. What is the radius of curvature of this mirror?
The ball goes through the net 3.10 m above the floor at a speed of 3.30 m/s. What is the work done on the ball by air resistance, a nonconservative force?
Jane, looking for Tarzan, is running at top speed (6.6 m/s) and grabs a vine hanging vertically from a tall tree in the jungle. How high can she swing upward?
A projectile is fired at an upward angle of 45° from the top of a 242 m cliff with a speed of 208 m/s. What will be its speed when it strikes the ground below? (Use conservation of energy.)
Consider a refrigerator with a coefficient of performance 6.1. Suppose the temperature in the room outside the refrigerator is 22 degrees Celsius. What is the lowest temperature (in degrees Celsius)
If the speed of a car is increased by 80%, by what factor will its minimum braking distance be increased, assuming all else is the same? Ignore the driver's reaction time.
A 16.0 kg box is released on a 35.0° incline and accelerates down the incline at 0.272 m/s2. Find the friction force impeding its motion. (N) What is the coefficient of kinetic friction?
A car can decelerate at -4.80 m/s2 without skidding when coming to rest on a level road. What would be the magnitude of its deceleration if the road were inclined at 13° uphill? Assume the same
At a distance from a point charge, the electric potential is 3200 and the magnitude of the electric field is 2.0×105 . What is the distance r?
An alpha particle (charge = +2.0 e) is sent at high speed toward a gold nucleus (charge = +79e). What is the electrical force acting on the alpha particle when it is 2.0 x 10-14 m from the gold nucl
Two narrow slits 50 microns apart are illuminated with light of wavelength 500nm. What is the angle of the m = 2 bright fringe in degrees? What is the highest possible value of the order number m he
A cork floats on the water as a water wave passes by. What happens to the cork? Will the cork's vibrational frequency be related to the water wave's frequency, and if so, how?
Consider a pulsar, a collapsed star of extremely high density, with a mass M equal to that of the Sun (1.98 × 1030 kg), a radius R of only 17.7 km, and a rotational period T of 0.0642 s. By wh
What is the emf of a battery with a 0.19 ohm internal resistance if the battery delivers 1.5A to an externally connected 6.0 ohm resistor?
A box with a weight of 50 N rests on a horizontal surface. A person pulls horizontally on it with a force of 10 N and it does not move. To start it moving, a second person pulls vertically upward on
The distance between an object and the screen is 2.56 m. A converging lens of focal length 25 cm is placed used to cast the image of the object on the screen. Where should the lens be placed?
A copper wire of cross-sectional area3.20 × 10-6 m2 and length 3.60 m has a current of 2.40 A uniformly distributed across that area. (a) What is the magnitude of the electric field (in N/C or
A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy
Find the magnitude of the angular deceleration of the cylinder.