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Water at the top of Niagara Falls has a temperature of 20.0°C. If it falls a distance of 40.0 m and all of its potential energy goes into heating the water, calculate the increase in temperature of the water at the bottom of the falls.
Suppose the tension in a cord is 14.0 N. If the speed of a wave in the cord is 8.50 m/s, then what must be the linear mass density of the cord
he electron mass is 9×10?31 kg. What is the magnitude of the momentum of the electron
A 818 kg car is going 28 m/s and the driver has to slam on his brakes to prevent an accident. find the change in temperature of the brake pads and rotors
A 10.4-g bullet is fired into a stationary block of wood having mass m = 5.03 kg. determine the original speed of the bullet
A 2.60-g lead bullet at 28.0°C is fired at a speed of 230 m/s into a large block of ice at 0°C, in which it becomes embedded. What quantity of ice melts
A microwave oven can heat 205 of water from 20.0 to 90.0 in 2.00 . If the wavelength of the microwaves is = 15.2 , how many photons were absorbed by the water?
Do sound waves exhibit diffraction effects? If so, determine the "slit" width that would diffract an audible sound wave (frequency between 20 Hz and 20 kHz). Would a doorway work or do you need a different sized opening?
q1. for safety in climbing a mountaineer uses a nylon rope that is 69 m long and 1.0 cm in diameter. whilst supporting
A projectile projectile is fired at an upward angle of 45o from the top of a 265-m cliff with a speed of 185 m/s. What will be its speed when it strikes the ground below
A passenger walks from one side of a ferry to the other as it approaches a dock. what are the direction and magnitude of the ferry's velocity relative to the water
q1. a cart starts from rest at the top of the tilted track. assume the track is frictionless. the cart passes photo
A fire helicopter carries a 520-kg bucket of water at the end of a 20.0-m long cable. Flying back from a fire at a constant speed of 40.0 m/s, Determine the force exerted by air resistance on the bucket
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