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A 23.0-N block rests on a horizontal surface. The coefficients of static and kinetic friction between the surface and the block are ?s=0.720 and ?k=0.630. A horizontal string is attached to the block and a constant tension T is maintained in the string. What is the force of friction acting on the block if T = 15.56 N? What is the force of friction acting on the block if T = 20.56 N?
The record distance in the sport of throwing cowpats is 81.1 m. This record toss was set by Steve Urner of the United States in 1981, Determine the initial speed of the projectile
A person runs with speed v toward a tunnel of length L, When the person and the photon eventually meet, the person's location is a fraction f along the tunnel. What is f
What is the new acceleration of box
Assume that ABC Firm has an optimal capital structure; comprised of debt, preferred stock and common equity. In this scenario, Firm currently has 48 percent debt, 4 percent preferred stock and 57 percent common equity in its capital structure.
A 0.954-kg toy car is powered by 2 C cells (3.00V total) connected directly to a small DC motor. The car has an effective energy conversion efficiency of 52.6%, What is the average current supplied to the car\'s motor
An ideal heat-engine is to be used in an environment where the ambient temperature is 22.50 °C. What must be the minimum temperature of the hot heat reservoir in order to reach at least 46.40 percent efficiency with heat-engine? (Give the answer i..
A train at rest emits a sound at a frequency of 1045 Hz. An observer in a car travels away from the sound source at a speed of 37 m/s. What is the frequency heard by the observer .
What is the initial (horizontal) velocity of the ball. An airplane needs to reach a velocity of 203 km/h to take off. On a 2000 m runway, what is the least acceleration necessary for the plane to take flight.
A 75-kg window air conditioner falls a distance of 6 m to the street below (no one is injured). What was the PE of the air conditioner
An electric scooter has a battery capable of supplying 140 Wh of energy. If friction forces and other losses account for 60 percent of the energy usage, what altitude change can a rider achieve while driving in hilly terrain, if the rider and scooter..
A cat runs along a straight line (the x-axis) from point A to point B to point C. The distance between points A and C is 5.00 m, distance between points B and C is 10.0 m, and the positive direction of x axis points to the right. The time to run f..
A 2.30 N force pushes it to the left, and a 0.800 N force pushes it to the right. (a) Taking right to be positive, what is the net force acting on it? (b) What is its acceleration?
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