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Bob and Joe are each making a 500 mile trip. Bob leaves at noon and drives 65mph uniformly. Joe leaves at12:40 pm. Find how fast does Joe have to drive (uniformly) to get to the end of the trip at the similar time Bob does?
if the coefficient of kinetic friction between the 50-kg crate and the ground is .3 determine the distance the crate
Two boats start together and race across a 62-km-wide lake and back. Boat A goes across at 62 km/h and returns at 62 km/h. Boat B goes across at 31 km/h, and its crew, realizing how far behind it is getting, returns at 93 km/h.
A small black ball of mass 100g and radius 2 cm hangs at restfrom a string of length 50 cm. what is the amplitude of the resulting oscillation
An 80 kg man is one fourth the way up a 10 m ladder that isresting against a smooth frictionless wall. What is the normal force of the wall on the ladder
A baton twirler is twirling her baton in a horizontal circle at a rate of 3.35 revolutions per second. Calculate the induced EMF between the center and one end of the baton
You are driving a car which is heading 25 m/s towards a brick wall. You sound a horn which emits at a frequency of 500 Hz when at rest. What is the beat frequency that you hear
A 64-kg runner rounds a circular track of radius 63.7 m at a constant 5.30 m/s. Find the magnitude of her momentum changes after she has gone one-fourth of the circle
A nuclear power plant generates waste thermal energy at a rate of 1000 MW = 1000 × 106 W. Assume the heat of vaporization of a water is 2.256× 106 J/kg. How much water must evaporate to cool the plant per day
an aluminum tray used for making ice cubes is filled with water and placed in a freezer at -19.8deg c. the emissivity
The medical profession divides the ultraviolet region of the electromagnetic spectrum into three bands: UVA (320-420 nm), UVB (290-320 nm), and UVC (100-290 nm). Find the frequency range associated with UVB radiation
Stars, to a good approximation, are spherical, and emit electromagnetic radiation from a surface of emissivity e = 1. What is the diameter (in millions of km) of this star
What does halving the frequency of a wave do to the other properties of a wave, like speed, amplitude, wavelength, period, etc.) Describe what happens to the wavelength, frequency, and spped of a wave as it moves from glass to air.
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