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A student decides to spend spring break by driving 50miles dues east, then 50miles 30degrees south of east, then 50miles 30degrees south of that direction, and to continue to drive 50miles deviating by 30degrees each time until he returns to his original position. How far will he drive, and how many vectors must he sum to calculate his displacement?
A 44.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.24 102 m/s from the top of a cliff 126 m above level ground, What is the initial total mechanical energy of the projectile
A 65-? loudspeaker, a 8.0-? loudspeaker, and a 2.1-? loudspeaker are connected in parallel across the terminals of an amplifier. Determine the equivalent resistance of the three speakers
A hollow sphere of inner radius 6.8 cm and outer radius 7.8 cm floats half-submerged in a liquid of density 750 kg/m3. What is the mass of the sphere
A 50 kg person performs a maximum vertical jump with an intial velocity of 2m/s. What is the performer's maximum kinetic energy during the jump
A sound pulse has a power of 948.5 watts. find the intensity of the sound at the time of observation
A rubber ball is dropped from rest 3.3m onto level ground. Bouncing back the ball loses 25% of its mechanical energy. To what height does it rebound
Antennas for radio transmission and reception are particularly effective if they're about a half-wavelength long. What's the appropriate length for an FM antenna
A 100 meter length of steel changes temperature by 30 C during the course of a day. If the coeffcient of thermal expansion of steel is 12 parts per million per C, what is the change in length of the steel
A 110 kg mail bag hangs by a vertical rope 4.0 m long. A postal worker then displaces the bag to a position 2.0 m sideways from its original position, always keeping the rope taut. As the bag is moved to this position, how much work is completed by t..
Find out the edge dimension of each cube
Two current-carrying wires are exactly parallel to one another and both carry 3.5 A of current. What is the direction of the magnetic force caused by wire 2 on wire 1
An aluminum cup contains 225 g of water and a 40 g copper stirrer, all at 27°C. A 490 g sample of silver at an initial temperature of 90°C is placed in the water. Calculate the mass of the aluminum cup
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