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Kekoa takes his bodyboards to Mauna Kea to use as a sled. From rest, he jumps onto the bodyboard and slides down a 5-m high hill (vertical height is 5-m). His speed at the bottom is 9 m/s. Kekoa's mass is 60 kg and the sled is 1 kg. How much thermal energy was produced in this process?
1. a calculate the efficiency of a carnot engine running between a low temperature of 27.0degc and a high temperature
What is the upward force that Olivia applies to the handles in order to hold the wheelbarrow in that position.
A wire is made of a material with a resistivity of 4.84004 × 10 ?8 ? · m. evaluate the resistance of the wire
What is capacitance a measure of, physically? Describe a typical RC circuit. Explain how voltage measured across a capacitor changes in time, both when the capacitor is charging and discharging.
An 8.4kg crate is pulled 4.7m up a 30? incline by a rope angled 16? above the incline. What is the increase in thermal energy of the crate and incline
a bicycle has wheels with a diameter of 0.680 m. it accelerates uniformly and the rate of rotation of its wheels
A block of weight W can slide on a horizontal surface. A force of W/n1 is applied to the right that causes the block to accelerate with acceleration equal to g/n2. g is the acceleration by reason of gravity. If the coefficient of kinetic friction is ..
The catapult on an aircraft carrier can take an aircraft from 0 to 197 mph ( the launch speed) in 5 Seconds, at which time the aircraft launches
Jennifer, who has a mass of 50.0 kg, is riding at 35.0 m/s in her red sports car when she must suddenly slamon the brakes to avoid hitting a deer crossing the road. What average force would the windshield have exerted on her
when a mass of 180g is attached to a vertical to a vertical spring and lowered to its equilibrium position, it is found that the spring extends 12cm. what is the period of the resulting oscillations
The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg. The density of water is 1.00 g/cm3.
A 3.00- length of copper wire at 20 has a 1.20--long section with diameter 1.8 and a 1.80--long section with diameter 0.90 . There is a current of 2.5 in the 1.8 -diameter section. What is the current in the 0.90 -diameter section? What is the magnit..
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