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If the tension (i.e., force) on a string increases 2 times but the density of the string remains constant, the new speed of waves on the string will be how many times greater than the original speed?
A 3.00-g copper penny at 25.0 C drops 50.0 m to the ground. (a) If 60 percent of the initial potential energy of the coin earth system goes increasing internal energy of the coin determine the coin's final temperature (b) does the result depends on m..
After flying for 13 min in a wind blowing 36 km/hat an angle of 21°south of east, an airplane pilot is over a town that is 60 km due north of the starting point. What is the speed of the airplane relative to the air?
A subway train rounds an unbanked curve at 70 km/h. Find what is the radius of the turn
A long solenoid has 130 turns/cm and carries current i. An electron moves within the solenoid in a circle of radius 2.80 cm perpendicular to the solenoid axis. Find the current i in the solenoid
A capacitor that has air between its plates is connected across a potential of 24.0 V and stores 48.0 uC of charge. Find the capacitance of the capacitor
An induced emf of 12V is produced when a 350 loop coil, ofradius 4.2cm is placed perpendicular to a magnetic field and turn90deg in 0.08s. calculate the intensity of the megnetic field
You work for Wham-O! Computer Inc. in its product testing department. Find the laptop velocity right before it hits the floor
A projectile is launched vertically from the surface of the earth with an initial speed of 7.00 km/s. At what height (km) will it stop and begin to fall back to the surface of the earth
Suppose that the mass of the dishwater is large as much as necessary so that its temperature does not change appreciably.
A 46.2 kg girl is standing on a 132 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. What is her velocity relative to the ice surface
If friction (rolling friction and air drag) results in a retarding force of 321 N at a speed of 50 km/h, what is the minimum energy needed to move the car a distance of 283 m at a constant speed of 50 km/h? (kJ)
A student yells across a street at a concrete wall. The student hears an echo 0.500 seconds later. If the speed of sound in air is 343 m/s, what is distance from the student to the wall only.
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