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Q. A 40kg child on a 2.30 m long swing is released from rest when the swing supports make an angle of 26 degrees with the vertical. The acceleration of gravity is 9.8 m/s2. If the speed of the child at the lowest position is 1.91047 m/s, what is the mechanical energy degenerate by the various resistive forces?
Regarding the Earth and a cloud layer 750m above the Earth as the "plates" of a capacitor, calculate the capacitance. Suppose cloud layer has an area of 1 km2 and that the air between cloud and ground is pure and dry.
Find out the angle that the total acceleration of the car. the car at the moment the car completes the circle.
An 75.0 spacewalking astronaut pushes off a 640 satellite, exerting a 80.0 force for the 0.440 it takes him to straighten his arms. How far apart are the astronaut and the satellite after 1.5 min.
The mass m =1 kg is set up as a pendulum of length 0.6m as shown on the diagram. Initially in the position of h = 0.2m above the lowest point, and the pendulum is given initial speed of 1m/s. What is the largest mass M that might be temporarily lifte..
A force vector has a magnitude of 569 newtons and points at an angle 41o of below the positive x axis. What is (a) x scalar component and (b) y scalar component of the vector.
Assume air resistance is negligible; from what height (in cm) above the compressed spring was the block dropped.
Suppose an ideal gas is in a container 3L in volume and allowed to expand by having a piston move. The final volume after the piston moves is 15L. If the gas is at first at a pressure of 1×10^5 Pa and a temperature of 300 K, and temperature is mai..
You are listening a soft music with a sound level of 50 dB. A subway train passes by whose sound level is 90 dB. What is total intensity level of the combined sound in dB.
A massless string runs around two massless, frictionless pulleys. An object with mass m = 12.20 kg hangs from one pulley. A force F is exerted on the free end of the string. What is the magnitude of the force F if the object is lifted at the constant..
Water flows at 5.0;{rm L}/{rm s} through a horizontal pipe that narrows smoothly from 10 cm diameter to 5.0 cm diameter. A pressure gauge in the narrow section reads 50 kPa. What does the other pressure gauge read.
A sailboat is heading directly north at a speed of 21 knots (1 knot = 0.514 m/s). The wind is blowing towards the east with a speed of 10.6 knots. (Both velocities are given relative to the Earth.)
A 100 arrow is shot vertically from a bow whose efficient spring constant is 500. If the bow is drawn 75 before shooting the arrow, to what height does the arrow rise .
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