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A 0.836-kg toy car is powered by one 9V battery (900 V) connected directly to a small DC motor. The car has an effective energy conversion efficiency of 58.1%, meaning that 58.1% of the electric energy applied to the motor is converted into translational kinetic energy. After 7.88 seconds, the car, which is initially at rest, reaches a speed of 2.35 m/s. What is the average current supplied to the car's motor?
Review Interactive Solution 4.41 in preparation for this problem. A 90.0-kg baseball player slides into second base. What is the magnitude of the frictional force
The Hale Telescope The 200-inch-diameter concave mirror of the Hale telescope on Mount Palomar has a focal length of 16.9, What is the magnification of her image
A loop of wire in the shape of a rectangle of width 8 cm and length 90 cm and a long, straight wire carrying acurrent I= 5t^1.4-3t^1.8 downward lie on a tabletop; What is the direction of the induced current
A car traveling 56.4 km/h is 24.7 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.11 s later. (a) What is the car's constant deceleration magnitude before impact? (b) How fast is the car traveling at impact?
A child of mass 24 kg sits 2.10m to the left of the center of a seesaw. The mass of the seesaw is 35 kg. How far to the right of the central pivot must a second child of mass 40 kg sit if the seesaw is to be perfectly balanced.
Find the work required to move a planet satellite of mass 1890 kilogram from a circular orbit of radius 2R to one of radius 3R, where 3.95 x 106 meter is the radius of the planet
A pendulum makes 24 oscillations in 39s. The period is 1.6 s 1. Find the pendulum's length
The magnitude of the electric field due to a small dipole is measured to be 250 N/C at a location on the axis of the dipole, 2 cm from the center of the dipole. Approximately what is the magnitude of the electric field due to the dipole at a location..
A penny has a mass of 2.50 g, a diameter of 19.55 mm, find the density of the material from which the penny is made
A grinding wheel of radius 0.350 m rotating on a frictionless axle is brought to rest by applying a constant friction force tangential to its rim. The constant torque produced with this force is 71.5 N · m. Discover the magnitude of the friction forc..
A car tire makes contact with the ground on a rectangular area of 12 cm by 18 cm. The car's mass is 1050 kg. What pressure does the car exert on the ground
A golf ball strikes a hard, smooth floor at an angle of ? = 32.4° and, rebounds at the same angle. What is the magnitude of the impulse applied to the golf ball by the floor
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