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A cord is 20cm long, four complete waves fit along its length when vibrated 30 times per second for the waves on the cord. What is the wavelength? What is the frequency? What is the speed?
Two charges are held 0.5 m apart and exert a force of 32 N on one another. what is the force they exert on one another
A near-sighted person might correct his vision by wearing diverging lenses with focal length f = -40cm. Use ray tracing to determine the height of the image
In a television set the power needed to operate the picture tube comes from the secondary of a transformer. Find the current in the primary
When you are running and want to stop quickly, you must decelerate quickly. Estimate the rate of deceleration of a person running at top speed of 6 {\rm m/s} to come to rest at 2 {\rm s}
a 24 kg block slides with an initial speed of 14 ms up a ramp inclined at an angle of 25o with the horizontal. the
An electric dipole is formed from two charges, , spaced 1.50cm apart. The dipole is at the origin, oriented along they-axis. What is the electric field strength at the point
In an experiment in physics class, a model solid-fueled rocket is fired vertically with an acceleration of 3 m/sec2 for 6 seconds. After that time, What is the maximum altitude the rocket reaches
A 265.0 kg block of ice at 0o C is placed in a large lake. The temperature of the lake is just slightly higher than 0o C, and the ice melts. What is the entropy change of the lake
Water is at rest at the bottom of a well of depth h = 7.82 m. A pump lifts mass at a rate of dm/dt = 119 kg/minute from the well and ejects it with a speed v = 3.74. m/s. find P, the power (energy per time) needed to do this work
Upton Chuck is riding the Giant Drop at Great America. If Upton free falls for 2.6 seconds, what will be his final velocity and how far will he fall
Find the scalar product of the two vectors A = 3.00i + 3.00 j and B = 7.00i - 1.00j. Find the angle between these two vectors
You are holding a 35 kg dumbbell straight out at arm's length. Assuming your arm is 0.74 m long, what torque is the dumbbell exerting on your shoulder
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