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A 38g glass thermometer reads 20.7C before it is placed in 122mL of water. When the water and thermometer come to equilibrium, the thermometer reads 42.2C. What was the original temperature of the water?
When a potential difference of 19 V is applied to a given wire, it conducts 0.30 A of current. What is the resistance of the wire
A sledge loaded with bricks has a total mass of 18.3 kg and is pulled at constant speed by a rope inclined at 19.7° above the horizontal. What is the mechanical energy lost due to friction
The siren of a police car atrest emits a predominant frequency of 1600 Hz and the police car isovertaking you from the rear, at a speed of 200 km/h. What frequency do you hear initially
An artificial earth satellite has a circular orbit of radius 5.91 106 m (which means it is orbiting approximately -450 km above the surface of the earth) in an equatorial plane. Find the satellite's instantaneous acceleration at time t. Magnitude? ..
Two resistors of 20 ohms and 25 ohms are connected in parallel. find the potential difference across the third resistor
A proton and an electron are both accelerated through a potential difference of 7200V. What is the velocity of each particle
A component with a 20 Ohm resistor is rated for use at power levels not exceeding 2,282 mW. How much current can safely flow through the component
A spherical weather balloon is filled with hydrogen until its radius is 3.10 m. Its total mass including the instruments it carries is 11.0 kg. Find the buoyant force acting on the balloon
A heat engine does 250 J of work per cycle while exhausting 700 J of heat to the cold reservoir. What is the engine's thermal efficiency
A 6V battery is connected in series with a 1.5V flashlight. what possible terminal voltages are available
A ball is kicked with an initial velocity of 16 m/s in the horizontal direction and 14 m/s in the vertical direction. What maximum height is attained by the ball
A plane touches down for a landing with a ground speed of 120 mi/h (53.7 m/s). What is the plane's acceleration while stopping
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