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An ambulance is driving away at 70 kilometer per hour. It emits a siren sound with rest frequency of 2,400 Hertz. Find what actual frequency do you hear? Determine the rest and moving wavelengths.
electrons are ejected from a metallic surface with speeds up to 460000 m/s when light of wavelength 650 nm is used. find the work funtion
A uniform ladder 10.0 m long is leaning against a frictionless wall at an angle of 60.0° above the horizontal. find the magnitude of the frictional force exerted on the ladder
a mass M is hanging from two strings. There is a tension of 34 N in the string on the left and a tension of 24 N in the string on the right. How heavy is the object
q1. a mountain climber in the process of crossing between two cliffs by a rope pauses to rest. she weighs 550 n. as
A small object is 10 cm to the left of a converging lens (f = +5 cm), and a second diverging lens (f = -3.3 cm) is 5.8 cm to the right of the first. Find the position and magnification of the final image by calculation
Unpolarized light passes through two polarized sheets. Theaxis of the first is vertical and that of the second is at16degrees to the vertical. What is the fraction of the initiallight that is tranmitted
a wire has a length of 6.52 times 10-2 m and is used to make a circular coil of one turn. there is a current of 4.31 a
Suppose after charging a 2.5 µF capacitor to 9 V, you connect it to the second uncharged capacitor of 14 µF. What voltage will your voltmeter read across the second capacitor
A thin spherical copper shell of radius 9.5 cm carries an excess charge of -4.2 nC. How many excess electrons are on the outer surface of the shell
How much work is completed by the Moon's gravitational field as a 915kg meteor comes in from outer space and impacts on the Moon's surface.
A small immersion heater is rated at 950 W. Estimate how long it will take to heat a cup of soup (assume this is 250 mL of water) from 17 degrees C to 77 degrees C.
a driver sets out on a journey. for the first half of the distance she drives at the leisurely pace of 30 mih she
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