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A thief was trying to pull a 20 kg coffer (a coffer is a box usually used to hold valuables) along an essentially frictionless horizontal surface. The tension in the rope was 25 N and the rope made an angle of 30° with respect to the horizontal. The thief pulled the coffer over a distance of 5 m.
What was the work done on the coffer by the rope?
The coffer was pulled from rest. What was the change in the coffer´s kinetic energy by the end of the 5 m trip?
What was the coffer´s speed at the end of the trip?
The tractor beam exerts a constant force of 4.0 104 N on the shuttlecraft. Both spacecraft are initially at rest. Explain how far does the starship move as it pulls the shuttlecraft aboard?
An automobile starter motor has an equivalent resistance of 0.0660 ? and is supplied by a 12.0-V battery with a 0.0170-? internal resistance. What is the current to the motor
Assume that the net horizontal force is due to rolling friction only and take free-fall acceleration to be = 9.80 .What is the coefficient of rolling friction for the tire under low pressure.
A resistor is connected across the terminals of a 9 V battery, which delivers 1.27E+5 J of energy to the resistor in 8.00 hours
A fisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of water. It takes a time of 2.30s for the boat to travel from its highest point to its lowest, a total distance of 0...
A car travels north at 28.9 m/s for 14.3 min. It then travels south at 40.1 m/s for 28.5 min. a) What is the total distance the car travels? b) What is the displacement of the car?
The heat of fusion for water is 80. cal/g. How various calories of heat are released when 20.0 g of water at 30. °C is cooled to 0 °C and frozen to ice at 0 °C
a loaded cart has a total mass of 227kg.if a 312n force acting at an angle of 30degree to the ground is applied. how much work is done in moving the cart 15meters?
What is the acceleration of a car that moves at a steady velocity of 100 km/h for 100 second? Explain your answer and state why this question is an exercise in careful reading as well as in physics.
A parallel-plate capacitor has square plates that are 6.00cm on each side and 4.20mm apart. If the potential difference between the plates is 78.0V , how much electrical energy is stored in the capacitor
Two stationary positive point charges, charge 1 of magnitude 3.80 and charge 2 of magnitude 1.95 , are separated by a distance of 38.0 . An electron is released from rest at the point midway between the two charges.
Suppose a 65 kg person stands at the edge of a 6.5 m diameter merry-go-round turntable that is mounted on frictionless bearings and has a moment of inertia of 1850 kg m2. Calculate the angular velocity of the turntable
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