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A battery has Vemf = 12.0 V and internal resistance r = 1.17 W. What resistance, R, can be put across the battery to extract 11.9 W of power from it? If there are 2 possible answers, enter the larger resistance
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A force of 10 N applied to a block of ice with a mass of 10 kg moves it over a factory floor with a constant speed. What is the coefficient of kinetic friction between the block and the floor?
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A hawk flies in a horizontal arc of radius 13.4 m at a constant speed 3.70 m/s. It continues to fly along the same horizontal arc, but increases its speed at the rate of 1.05 m/s2. Find the acceleration in this situation at the moment the hawk's speed is 3.70 m/s. . Find the acceleration...
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A 4.80-g bullet is moving horizontally with a velocity of +342 m/s, where the sign + indicates that it is moving to the right (see part a of the drawing). The bullet is approaching two blocks resting on a horizontal frictionless surface. Air resistance is negligible. The bullet passes completely...
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the figure the man hanging upside down is holding a partner who weighs 595 N. Assume that the partner moves on a circle that has a radius of 6.50 m. At a swinging speed of 4.45 m/s, what force must the man apply to his partner in the straight-down position?
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In outer space a rock of mass 4 kg is attached to a long spring and swung at constant speed in a circle of radius 6.5 m. The spring exerts a force of constant magnitude 600 N. What is the speed of the rock? The magnitude of the velocity vector = _____ m/s The direction of the spring force...
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The loaded cab of an elevator has a mass of 3.0 103 kg and moves 152 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab?
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Knowing the sign of the work done on an object is a crucial element to understanding work. Positive work indicates that an object has been acted on by a force that tranfers energy to the object, thereby increasing the object's energy. Negative work indicates that an object has been acted...
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What is the maximum height reached by the rocket?
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An object is dropped from rest and falls freely. After 22.2 seconds, calculate its instantaneous speed.
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- The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
- (a) What is the average angular acceleration of the Earth?
- (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
- 2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?
- A spherical balloon is made from a material whose mass is 3.00-kg. The thickness of the material is negligible compared to the 1.5-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute pressure of the helium gas
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