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An iron boiler of mass 257 kg contains 861 kg of water at 18.9°C. A heater supplies energy at the rate of 46300kJ/hr. How long does it take for the water to reach the boiling point? Specific heat of iron = 450J/(kg·K).
How long does it take for the water to all have changed to steam? Latent heat of vaporization of water is Lv = 2260 kJ/kg.
A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 54 dB by an observer 10 km away. Treat the horn as a point source and neglect any absorption of sound by the air. What is the average power generated..
An electric ceiling fan is rotating about a fixed axis with an initial angular velocity magnitude of 0.260rev/s. What is the magnitude a of the resultant acceleration of a point on the tip of the blade at time t = 0.196s
A 4.7-g object moving to the right at 18 cm/s makes an elastic head-on collision with a 9.4-g object that is initially at rest. What is the velocity of the 4.7-g mass after the collision
Your car tire is rotating at 3.3 rev/s when suddenly you press down hard on the accelerator. What was the tire's angular acceleration
One end of a copper rod is in thermal contact with a hot reservoir at 995 K, Find the entropy change of cooler reservoir
You want to propel a 1.50 kg t-shirt from a spring-loaded launcher to a velocity of 10.0 m/s. How far back do you have to compress the spring
An aluminum rod is clamped one quarter of the way along its length and set into longitudinal vibration by a variable-frequency driving source. The lowest frequency that produces resonance is 4300 Hz. The speed of sound in an aluminum rod is 5100 m..
A surfer is zipping northeast across the river with a velocity of 10 m/s relative to the water. what is the true velocity of the surfer
A 200 g block is pressed against a spring of force constant 1.40 kN/m until the block compresses the spring 10 cm. The spring rests at the bottom of a ramp inclined at 60.0 degrees to the horizontal.
A 12 V battery (which has an electric potential difference of 12 V between its terminals) is connected to a 10 W light bulb for 1 second. Calculate how much charge flows through the light bulb in the 1 second.
an explosion breaks an object initially at rest into two pieces one of which has 2.8 times the mass of the other. if
Dan is gliding on his skateboard at 2m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 7.00m/s (as measured by an observer on the ground). Dan's mass is 50 kg and the skateboard's mass is 5.00 kg.
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