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An automobile having a mass of 1,000 kg is driven into a brick wall in a safety test. The bumper behaves like a spring with constant 5.55 106 N/m and is compressed 3.24 cm as the car is brought to rest. What was the speed of the car before impact, assuming no energy is lost in the collision with the wall?
When a 0.213-kg mass is attached to a vertical spring it causes the spring to stretch a distance d. Find the stretch distance, d
Emilie's potter's wheel rotates with a constant 2.00rad/s2 angular acceleration. What was the angular velocity of the wheel at the beginning of the 3.60s interval
To get the top spinning, its string is pulled with a tension of 0.30. Explain how long does it take for the top to complete the first five revolutions? The string is long enough that it is wrapped around the top more than five turns.
The sound intensity in front of a loudspeaker diaphragm vibrating at 2kHz is 4.3 W/m^2, with an acoustic power output of 0.3W. Calculate the diameter of the diaphragm. in cm
Sketch a free body diagram for the hot air balloon. When the burner is turned on what force is required to cause an upward acceleration of 5m/s squared?
Consider a parallel-plate capacitor of 220 uF capacitance connected to a 1500 volt power source. The distance between the plates is .01 m. What is the charge in the capacitor
A 4.47 m long pole stands vertically in a lake having a depth of 2.22 m. while the sun is 62.6 degrees above the horizon, find the length of the pole's shadow on the bottom of the lake.
State the direction as an angle with respect to the +x axis.
The electrons in a metal that produce electric currents behave approximately as molecules of an ideal gas. The mass of an electron is me = 9.109x10-31 kg. If the temperature of metal is 311 K, what is the root-mean-square speed of the electrons.
Ricardo and Jane are standing under a tree in the middle of a pasture. An argument ensues, and they walk away in different directions. Ricardo walks 24.0 in a direction 60.0 west of north. Jane walks 12.0 in a direction 20.0 south of west. They then ..
The flywheel of an engine has a moment of inertia 2.2 {rm kg} cdot {rm m} ^{2} about its rotation axis. What is its final kinetic energy.
Indicate the negative x direction by including a negative sign in the answer, but omit a sign for the positive x direction.
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