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A child whose weight is 284 N swings out over s pool of water usinga rope attached to the branch of a tree at the edge of the pool. The branch is 11.7 m above ground level and the surface of the poolis 1.48 m below ground level. The child holds onto the rope at apoint 5 m from the branch and moves back until the angle betweenthe rope and the vertical is 26o. When the rope is inthe vertical position, the child lets go and drops into the pool. Find the speed of the child at the surface of the pool?
An air conditioner is used to keep the interior of a house at a temperature of 25C while the outside temperature is 34C, what is the mechanical power required to keep the house cool?
what are the wavelengths of electro magnetic waves in free space that have frequencies of a) 5.00 x 10^19Hz, b) 4.00 x 19^9.
One trajectory that can be used to send spacecraft from Earth to Mars is an elliptical orbit that has Sun at one focus, its perihelion at Earth, Find the semimajor axis of the ellipse
An object is 15 cm in front of a diverging lens that has a focal length of -8.7 cm. How far in front of the lens should the object be placed
A 0.174kg softball is pitched horizontally at 26m/s. the ball moves in the opposite direction at 38m/s after it is hit by the bat.
The driver of a 1485 kg car is driving along a street at 25.0 mph. Another driver, coming from directly behind, with what combined speed do they begin to skid
Mark and Clark are identical twins at the amusement park riding on the bumper cars. Both boys have the same mass, 85kg. The cars are identical with a mass of 120 kg.
a spring has a spring constant of 47.3 nm. a mass of 300 grams is added to the end of the spring and the mass -spring
A 0.246-kg toy car is powered by three D cells (4.50 V total) connected directly to a small DC motor. The car has an effective energy conversion efficiency of 36.1%, What is the average current supplied to the car\'s motor?
A flashlight on the bottom of a 3.70 m deep swimming pool sends a ray upward at an angle, What angle (in air) does the emerging ray make with the water's surface
On a cold winter's day heat leaks slowly out of a house at the rate of 25.0kW. find the rate of entropy increase
In the 1994 movie Speed, a bus wired with explosives must maintain a speed of 50mph or the bus will explode. what is the minimum launch angle required for the jump to be successful
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