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The drawing shows a person whose weight is W=584 N doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position.
He sees the truck's headlights, and hears a 500 Hz horn. How rapidly is the truck approaching him, in m/s2? In mph?
A 63 -kg ice skater coasts with no effort for 68 m until she stops. If the coefficient of kinetic friction between her skates and the ice is = 0.10, how fast was she moving at the start of her coast
A 1800 kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 6.00 m before coming into contact with the top of the beam, and it drives the beam 14.0 cm farther into
Solar energy is incident on the pond at an average rate of 400 {rm{ W/m}}^2. If the water absorbs all the solar energy and does not exchange energy with its surroundings, how many hours will it take
An infinitely long line of charge has a linear charge density of 5.50×10-12 C/m. A proton is at distance 17.5 cm from the line and is moving directly toward the line with speed 2900 m/s. How c
What is the magnitude of the induced (E) in the coil at the instant the magnetic field has a magnitude of 46mT? Answer in units of V
An empty flask has a mass of 123.4g. When the flask is filled with water, the mass is 211.6 g. If 10.0 of zinc (d=7.14 g/cm3) are added to the flask filled with water (and the sides of the flask are
Three equal point charges, each with charge 1.45 , are placed at the vertices of an equilateral triangle whose sides are of length 0.600 . What is the electric potential energy of the system?
An proton (m = 1.67 ´ 10-27 kg and q = 1.6 ´ 10-19 C) travelling at 2.7 × 105 ms-1 enters a magnetic field of 1.2 T at right angles to the direction of motion of the electron. What
The mass of a roller-coaster car, including its passengers, is 525 kg. Its speed at the bottom of the track in the figure below is 20 m/s. The radius of this section of the track is r1 = 23 m. Find
Take acceleration due to gravity to be 9.81 m/s^2. Use the work-energy theorem to calculate the minimum speed v that you must give the box at the bottom of the incline so that it will reach the skie
A 3.00mm diameter copper ball is charged to +20.0nC, What fraction of its electrons have been removed?
What magnitude of the force vec{F} applied tangentially to the rotating crank is required to raise the crate with an acceleration of 0.80 m/s^2?
How rapidly does the magnetic field intensity decrease with distance from the center of the circular coil (a) along the coil's axis and (b) to the side of the coil?
A speedboat moving at 38.0 m/s approaches a no-wake buoy marker 100 m ahead. The pilot slows the boat with a constant acceleration of -3.00 m/s2 by reducing the throttle.
The volume of an ideal gas is increased from 0.7 m3 to 2.7 m3 while maintaining a constant pressure of 3000 Pa (1 Pa = 1 N/m2). If the initial temperature is 600K, what is the final temperature?
The skier is traveling with a speed of 8.00 m/s. How much force must you apply, in newtons, over the 12.0 meter flat stretch?
A dynamite blast at a quarry launches a chunk of rock straight upward, and 1.6 s later it is rising at a speed of 20 m/s. Assuming air resistance has no effect on the rock, calculate its speed at (a
In reality, the angular speed of a baggage carousel does not change. Therefore, what must be the external torque acting on the system if ten bags are dropped each minute?
In a college homecoming competition, eighteen students lift a sports car. While holding the car off the ground, each student exerts an upward force of 390 N. What is the mass of the car in kilograms
The tension in a wire clamped at both ends is doubled without appreciably changing its length. What is the ratio of the new to the old wave speed for transverse waves in this wire?
A seed shoots out from the pod with the speed of 3.0 m/s but with a direction of motion 30° below the horizontal. The seed pod is initially 1.0 m above the ground.
The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the positive direction. From what height did the student fall? Assume that the only force acting
With the same double slit, what momentum magnitude pB is necessary so that an angle of θB = 17.6 x 10-4 degrees locates the first-order bright fringes?