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A 500 N box slides down a 10.0 m high playground slide. it starts from rest, and its speed at the bottom is 4.5 m/s. What is the change in thermal energy of the box and the slide?
A 2.30-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 3.40sin (2pi*t), where F is in newtons and t is in seconds. The force constant of the spring is 35.0 N/m.
Does current through a power supply increase when parallel bulbs are added? For example, if you have a circuit with one bulb and measure the current through the bulb to be 100 mA, what is the current through the power source when you add another b..
Jack and Jill are standing on a crate at rest on the frictionless, horizontal surface of a frozen pond. What is the final speed of the crate if Jack jumps first and then a few seconds later Jill jumps in the same direction
Chemists usually speak of valence electrons. What is the corresponding term usually employed by physicists?
In designing a transformer, an engineer knows she needs 240 V to come out of the secondary circuit. what is the ratio of primary voltage to primary turns
A mass of 346.4 g with unknown composition is heated in an oven to a temperature of 311.6 °C. The mass is then dropped into a strong insulated calorimeter containing 710.3 g of water.
If 0.040kg of ice at 0 C is added to 0.390kg of water at 30 C in a 0.130-kg aluminum calorimeter cup
A car starts from rest and travels 20 m within 4 seconds, in a straight line, at constant acceleration. What is the acceleration of this car
Three resistors of 3.0 k\Omega, 5.0 k\Omega, and 4.0 k\Omega are connected in series across a 12V battery. What is the equivalent resistance? What is the current during the resistors? What is the voltage drop across each resistor?
Two hikers begin on opposite sides of a circular lake and walk around the lake in the same direction. How far does the faster hiker walk before catching up to the slower one
In a physics lab experiment, a spring clamped to the table shoots a 21 g ball horizontally. When the spring is compressed 18 cm, the ball travels horizontally 5.1 m and lands on the floor 1.7 m below the point at which it left the spring. What is the..
Suppose V rms = 240 V for an alternating current power source. What is the amplitude of the voltage for the source
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