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A 39.0-kg boy, riding a 2.60-kg skateboard at a velocity of 5.70 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.00 m/s, 7.30° above the horizontal. Ignore any friction between the skateboard and the sidewalk. What is the skateboard's velocity relative to the sidewalk at this instant? Be sure to include the correct algebraic sign with your answer.
In an engine, an almost ideal gas is compressed adiabatically tohalf its volume. In doing so,1380 J of work is done on the gas. What is the change in internal energy of the gas
Find out the force each hand exerts on the shaft when the shaft is rotating in the horizontal plane about its center at 5×10-2 {rm rev/s}.
A 1200-kg car travels at a constant speed of 18.00 m/s around a circular track that is 80m across. What is the kinetic energy of the car?
A driver running 1.9 m/s dives out horizontally from the edge of a vertical cliff and 2.4 s later reaches the water below. Part A) How high was the cliff?
Two trains on separate tracks move toward each other. Train 1 has a speed of 129 km/h; train 2 a speed of 75.0 km/h. What is the frequency heard by the engineer on train 1
A guitar player tunes the fundamental frequency of a guitar string to 300 Hz. (a) What will be the fundamentalfrequency if she then increases the tension in the string by 20%?
Two people hear a tornado siren, but one listener is 22.5 times farther away from the source of the sound than the other. What is the intensity level (in dB) at the farther listener relative to the other listener
A cannonball is catapulted toward a castle. The cannonball velocity when it leaves the catapult is 40 m/s at an angle of 37%uF0B0, What is the cannonball%u2019s impact speed when it lands
A star moving away from the Earth at 0.320c emits radiation that we measure to be most intense at the wavelength 530 nm. Determine the surface temperature of this star
Given that the weight of dry sandstone sample in air is 20.0g, the weight of saturated sample in air is 22.5g, What is the bulk volume of this sample and what is its porosity
determine the resultant displacement graphically.what is the magnitude of repulsive force pushing these two spheres apart.
A stationary horn emits a 113 Hertz tone. Find what frequency is heard by a passenger on a train which is moving towards this horn with a speed of 31.1m/s
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