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The drawing shows two boxes resting on frictionless ramps. One boxis relatively light and sits on a steep ramp. The other box isheavier and rests on a ramp that is less steep. The boxes arereleased from rest at A and allowed to slide down the ramps. Thetwo boxes have masses of 9 and 42 kg. If A and Bare 3.5 and 0.5 m, respectively, above theground, determine the speed of (a) thelighter box and (b) the heavier box wheneach reaches B. (c) What is the ratio ofthe kinetic energy of the heavier box to that of the lighter box atB?
A transformer is to be used to provide power for a computerdisk drive that needs 6.0 V (rms) instead of the 120 V (rms) fromthe wall outlet. Find the current in the secondary
A ball is thrown vertically upwards with an initial velocity of 21.84 m/s. Neglecting air resistance, how long is the ball in the air? What is the greatest height reached by the ball
A spacecraft in a circular orbit wishes to transfer to another circular orbit of quarter the radius by means of a tangential thrust to move into, Find the thrust factors required
Use Kirchhoff's laws to set up three simultaneous equations that can be solved for the value of each of the currents in Figure 3 in terms of the power supply voltages and the resistor values. Use the measured resistor and power supply voltage values ..
A vertical force F is applied to a block of mass m that lies on a floor. what happens to the magnitude of normal force on the block from the floor as magnitude F is increased from zero if force F is downward?
Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. What is her useful power output
aluminum has a density of 2700 kgm3. what is the resistance of an aluminum wire 0.12 cm in diameter and 80 m long? what
A 2.0 cm tall object is placed in front of a mirror. A 1.0 cm tall upright image is formed behind the mirror, 150 cm from the object. find Is the image erect or inverted
Suppose a car is traveling at 14 m/s, and the driver sees a traffic light turn red. After 0.50 s has elapsed (the reaction time) the driver applies the brakes and the car decelerates at 8.0 m/s2.
A transformer has 400 primary turns and 1510 secondary turns. The input voltage is 120 V and the output current is 16.0 A. Assume 100 percent efficiency. What is the output voltage
An X-ray tube is similar to a cathode-ray tube. Electrons are accelerated to high speeds at one end of the tube. What speed would this potential difference give to protons
The surface of the Sun has a temperature of 5500 C and the temperature of deep space is 3.0 K. Find the entropy increase produced by the Sun in one day, given that it radiates heat at the rate of 3.80x10^26 W.
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