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Q. While standing at a crosswalk, you hear a frequency of 560 Hz from an approaching police car. After the police car passes, its frequency is 480 Hz. What is the speed of the police car? (Speed of sound = 340 m/s)
Q. A 0.300-kg mass, attached to the end of a 0.750-m string, is whirled around in a smooth level table. If the highest tension that the string can withstand is 250 N, after that what highest linear speed can the mass have if the string is not to break?
An object has a kinetic energy of 257J and a momentum of magnitude 21.8 kg·m/s. Find out the speed and the mass of the object.
Suppose the highway is icy and the coefficient of friction between the tires and pavement is only one-third what you found in part (1). What should be the maximum speed of the car so it can round the curve safely.
A fisherman standing on the edge of a pier hooks a fish on the surface of the water, and reels in the fishing line at a constant 0.50m/s. If the fisherman's fishing rod is a height of 3.0 m above the water, at what speed is the fish moving (horizonta..
A 0.2kg aluminum plate, initially at 20C, slides down at a 15.00 m long surface, incline at a 30 degree angle to the horizontal. The force of kinetic friction exactly balances the component of gravity down the plane so that the plane.
A 2.20 sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as heart beats. The reflected sound is after that mixed with the transmitted so..
A 53 kg skier skis directly down a frictionless slope angled at 12° to horizontal. Choose the positive direction of the x axis to be downhill along the slope.
he lower block in the figure is pulled on by a rope with a tension force of 20 N. The coefficient of kinetic friction between the lower block & the surface is 0.30. The coefficient of kinetic friction between the lower block & the upper block is a..
Calculate the total cost ($/kWh) of electricity delivered to the grid including fuel cost and debt charge with O&M of 5% added to the total.
Assume that it takes 2.30 kg of oxygen to burn 1.00 kg of coal. (The actual amount varies with the type of the coal). What is the total mass of the reagents used in the combustion all through the 30 days.
What mass (in grams) of steam at 100°C must be mixed with 251 g of ice at its melting point, in a thermally insulated container, to create liquid water at 66.0°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, an..
For instance, the flute can be described as an open-open pipe because a flutist covers the mouthpiece of flute only partially. Meanwhile, a clarinet can be described as an open-closed pipe as the mouthpiece of the clarinet is almost completely closed..
A 28 kg child plays on a swing having support ropes that are 1.80 m long. A friend pulls her back until the ropes are 43 from the vertical and releases her from rest.
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