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How much work does a supermarket checkout attendant do on a can of soup he pushes 0.450 m horizontally with a force of 4.40 N? Express your answer in joules and kilocalories.
The driver of a 1720kg car traveling on a horizontal road at 102km/h suddenly applies the brakes. How many meters does it travel before stopping under these conditions
A 75-m long train begins unknown uniform acceleration from rest.The front of the train has a speed of 23 m/s when it passes arailway worker who is standing 180m from where the front of the train started. What will the speed of the last car be as i..
A battery powers some DC circuit. When the current is 40.0 mA, the voltage available to the circuits is 11.2V. When the current is doubled the voltage available decreases to 10.4 V. What is the internal resistance of the battery?
a child is in danger of drowning in the merimac river. the merimac river has a current of 3.4 kmhr to the east. the
A 5.00F and a 8.00F capacitor are connected in series, and this combination is connected across a 46.0V potential difference..Calculate the charge on first capacitor. Calculate the charge on the second capacitor Calculate the potential difference acr..
How much waste heat is produced? Once it is brought back to rest (assuming the engine shuts off at the end of the race), how much waste heat has been produced?
Suppose both skaters are initially moving v, but one has mass m and the other 2m. What point do they rotate about after they meet? What is the linear velocity of this point? What is the angular velocity of the system
A 175-g lump of molten lead at its melting point, 327°C, is dropped into 55 g of water at 20.0°C. What is the temperature of the water when the lead becomes solid? When the lead and water are in thermal equilibrium, what is the temperature?
On an icy (nearly frictionless) street a 600 kg car traveling straight east at 5 m/s collides with a 1000 kg car traveling straight north at 3 m/s. what is the final speed of the second car
In this section assume the sound speed in air is 343 . A goose flying toward you at 12.4 emits a squawk, which you hear at 251. Find the wavelength of the sound you hear
An inventor claims to have devised a cyclic engine which exchanges heat with reservoirs at 300 K and 540 K, and which can produce 450 J of work per 1000 J of heat extracted from the hot reservoir. Is his claim feasible.
A water tower is a familiar sight in many towns. The purpose of such a tower is to provide storage capacity and to provide enough pressure in the pipes that deliver the water to customers. The drawing shows a spherical reservoir that contains6.61 x 1..
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