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A 2000 kg car is traveling at a constant 15.0 m/s down a long mountain grade of 2.0%. The mountain road is 5.0 km long. The driver must "ride the brakes" to maintain a constant speed down the slope. The heat generated at the brakes due to friction heats up the brakes. The mass of the brake system is 20.0 kg and has a specific heat of 0.200 kcal/kg °C (837.2 J/kg °C). What is the increase in the temperature of the brakes?
A friend of yours is loudly singing a single note at 410 Hz when racing toward you at 26.1 m/s on a day when the speed of sound is 339 m/s. What frequency does your friend hear if you suddenly start singing at 410 Hz.
A note played on a piano is 4719 Hz. If the speed of sound is 347 m/s, what is the wavelength of the note?
A seasoned mini golfer is trying to make par on a tricky hole #5, at what speed must the golfer hit the ball to land the ball in the hole
A 2.00 m tall basketball player wants to make a goal from 10.0 m from the basket. If he shoots the ball at a 45.0° angle, at what initial speed should he throw the basketball so that it goes through the hoop without striking the backboard.
A wooden raft has a mass of 65 kg. When empty it floats in water (density 1000 kg/m3) with 41percent of its volume submerged. What mass of sand can be put on the raft without it sinking.
The propulsion system on a 1500kg rocket car fires for 15 seconds and the propulsion force is equal to F= x(80-x). What is the average speed for the entire two stage event
An unstrained horizontal spring has a length of 0.34 m and a spring constant of 290 N/m. Two small charged objects are attached to this spring, one at each end. The charges on the objects have equal magnitudes.
The potential difference between two points in a wire 10 m apart is 12 V. When the current density is 4*10^7 A/m^2. find the resistivity of the material in the wire
A 7.3×10?4V/m electric field creates a 5.0×1017electrons/s current in a 2.0-mm-diameter aluminum wire. What is the mean time between collisions for electrons in this wire
Illustrate the cause of the components accelerating from rest down the conveyor.
A very large number (N+1) polaroids are arranged in a sandwich, The transmission axis of each polaroid is at a constant angle, with respect to its predecessor
Estimate how far from a piece of paper you must hold the lens to produce a sharp image of a streetlight 40 ft. Overhead.
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