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A husband and wife take turns pulling their child in a wagon along a horizontal sidewalk. Each exerts a constant force and pulls the wagon through the same displacement. They do the same amount of work, but the husband's pulling force is directed 58 degrees above the horizontal, and the wife's pulling force is directed 38 degrees above the horizontal. The husband pulls with a force whose magnitude is 67 N. Calculate the magnitude of the pulling force exerted by his wife.
A skier starts from a height of 200 meter and slides down a frictionless slope. Find the speed of the skier at a height of 56 meter
A powerful motorcycle can produce an acceleration of 3.00 m/s2 while traveling at 90.0 km/h. What force does the motorcycle exert backward on the ground
A typical power transmission line carries a current of 1000 A about 30.0 meters above the ground. The magnetic field generated at ground level by the current is a matter of concern to those who live nearby.
A 10 kg dog is standing on scale in an accelerating elevator. If the scale reads 5 kg, what is the acceleration of the elevator
A thin lens has a focal length of 10 cm. An object is located 15 cm to the left of the lens. What is the total magnification of the lens system
A car with a mass of 950-kg and an initial speed of v1 = 22.2 m/s approaches an intersection, Find the initial speed of the minivan
You have invented a new game and are playing it with your friends. You have a projectile launcher that fires a brick (mass=2 kg) with a speed and angle that you can adjust. What is the work done by friction during the block's motion
You push a 2.7 kg box with a force of 23.8 N along a level floor, but a frictional force of 3.3 N opposes the motion
a heater and a motor are powered in parallel from the same 220v power supply. the motor draws 2A and the heater draws 17A. what is the total power dissipated by the dryer
Imagine holding the above plastic block under water. When released, what is the upward acceleration of the block?
65kW is to arrive in a town over two 0.100Ω lines. Estimate how much power is saved if the voltage is steped from120V to 1200V and then downed downed again rather than transmittingat 120V
With the engines off, a spaceship is coasting at a velocity of+230m/s through outer space. The ship carries rockets that aremounted in firing tubes, What is the velocity of the rocket
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