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You’re out at the park with some friends where there is an open-air concert. Standing 20. meters from the stage, the music is a agreeably loud 90. dB. After a while you all decide to move somewhere quieter where you can hear each other talk. How far away from the stage must you go so that the music loudness is only 60. dB? You can suppose that the sound waves move uniformly in all directions—don’t worry about reflections off the ground.
How much energy is required to accelerate a spaceship with a rest mass of 112 metric tons to a speed of 0.445 c? Every day our Earth receives 1.55×1022 J energy from the Sun. If we were able to use 1.05 percent of this energy to accelerate spaceships..
Using thermogravimetric curve we can relate the mass changes to the stoichiometry involved. calculate the percentage weight loss for the following compounds when they are heated at uniform rate in thermogravimetric analysis.
A 42 kg pole vaulter running at 11 m/s vaults over the bar. Her speed while she is above the bar is 0.7 m/s. Avoid air resistance, as well as any energy absorbed by pole, and determine her altitude as she crosses the bar.
A person pushes a 16-kg lawn mower at constand speed with a force F= 80N directed along the handle, which is at an angle of 45 degrees to the horizontal. Calculate the magnitude of the Normal force exerted on the mower.
A uniform circular plate of radius 15 cm has a circular hole of radius 3 cm cut out of it. If the mass per unit area of material is 5 g/cm2, what is the mass of this object
A 900 N c rate s lides 12 m down a ramp that makes an angle of 3So with the horizontal. how much thermal energy is created
A crane lifts a 650-{\rm kg} beam vertically upward 23 {\rm m} and then swings it eastward 18 {\rm m}. How much work does the crane do
A capacitor is connected across the terminals of an ac generator that has a frequency of 430 Hz and supplies a voltage of 19 V. Find the capacitance of the second capacitor
A CD originally at rest reaches an angular speed of 39 rad/s in 4.8 s. What is the magnitude of its angular acceleration
Calculate the mass of a solid gold rectangular bar with dimensions 3.50 cm x 14.0 cm x 27.0 cm. Density of gold is 1.93E4 kg/m^3
Two wooden crates rest on top of one another. The smaller top crate has a mass of m1=20kg and the larger bottom crate has a mass of m2=88kg. what is the acceleration of the lower crate
A 150 g baseball is thrown toward home plate by a speed of 40.0m/s. The batter hits the ball directly back at the pitcher with a speed of 50.0 m/s. What is the change in momentum of the ball?
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