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Harry Potter (55kg) is riding his broom north when a Slytherin casts a spell to knock him from the broom. If Harry is blasted to the east and the broom is blasted to the west (velocity = 12m/s), what is Harry's velocity?
A migrating bird is initially flying south at 10 m/s. To avoid hitting a high-rise building, What is the bird's average acceleration during this 2 s interval
A drawing shows three identical springs hanging from the ceiling. Nothing is attached to the first springs, determine the weight of the block hanging from the third spring
A small glass bead has been charged to + 25nC . A tiny ball bearing 3.0cm above the bead feels a 1.8×10?2Ndownward electric force. What is the charge on the ball bearing
A mass moves from rest down an inclined plane with an angle of 60 degrees at the top. find the acceleration of the mass down the ramp
A particle moving along the x-axis has its position described by the function x =( 5.00 t3? 3.00 t+ 2.00 )m, what are the particle's position, velocity and acceleration
What is the apparent weight of a cube of iron of volume 0.2 m3 when it is submerged in water? The density of iron is 7800 kg/m3
A television set connected to a 120 outlet consumes 76 of power. -How much current flows through the television? -How long does it take for 10 million electrons to pass through the TV?
Unpolarized light passes through 5 parallel ideal polarizing filters. What is the ratio of the initial intensity to the final intensity of the light
A light ray is incident from air onto the surface of a very quiet lake. what is the index of refraction of the water
Transverse waves with a speed of 48.7 m/s are to be produced on a stretched string. What is the required tension in the string
Standing at a crosswalk, you hear a frequency of 500 Hz from a siren of an approaching ambulance. Determine the ambulance's speed from these observations
A 10.0-ohms resistor, a 10.0-mh inductor, and a 100 uF capacitor are connected in series to 50.0-V (rms) having variable frequency. find the energy delivered to the circuit during one period
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