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A woman at an airport is towing her 23.5-kg suitcase at constant speed by pulling on a strap at an angle ? above the horizontal. She pulls on the strap with a 37.0-N force, and the friction force on the suitcase is 20.0 N. What is the magnitude of the normal force that the ground exerts on the suitcase?
A simple pendulum is 4.00 m long. What is the period of small oscillations for this pendulum if it is located in an elevator accelerating upward at 2.00 m/s2
A 20-N block lifted straight upward by a hand applying a force of 20N has an initial kinetic energy of 16J. What is the block's final kinetic energy
A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 30.0 min at 90.0 km/h, 5.0 min at 90.0 km/h, Determine the average speed for the trip
A mass m=9.7 kg is suspended from a pulley with radius r=0.081 meters and moment of inertia I=0.26 kg/m^3. What is the net force of the system taking the block and pulley into consideration
A second baseman tosses the ball to the first baseman, who catches it at the same level from which it was thrown, What is the horizontal component of the ball's velocity just before it is caught
Consider an ideal gas at 27.0 degrees Celsius and 1.00 atmosphere pressure. What is the length L of an edge of each small cube if adjacent cubes touch but don't overlap
Several children are on a sled pulled by a four-wheeler across a level snow-covered field
A 50.0 kg skier is at the top of a slope. At the initial point at the top is 25.0 m vertically above point at the bottom. find the change in Potential energy of the skier-Earth system as the skier goes from top to bottom
A 2.0cm×2.0cm×7.0cm block floats in water with its long axis vertical. The length of the block above water is 1.0cm. What is the block's mass density
Lithium, beryllium, and mercury have work functions of 2.30eV,3.90eV, and 4.50eV respectively. Find the maximum kinetic enery for the photoelectrons in each case
Explain what was observed with the horizontal motion of the man and the boat in terms of Newton's Laws of Motion.
From street level, Superman spots Lois Lane in trouble-the evil villain, Lex Luthor, Determine how long Superman takes to reach her
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