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1) A 10 kg wooden box is resting on a wooden floor. What is the minimum horizontal force that must be applied to the box to get it moving? The coefficient of static friction between the box and the floor is 0.50.
2) Once the box in the previous problem is moving, what force must be applied to keep it moving at a constant speed if the coefficient of kinetic friction between the box and the floor is 0.30?
3) What force must be applied to the box in the previous problem to accelerate it at 5.0 m/s2? (Assume it is already moving, so consider kinetic friction.)
A glass window 0.35cm thick measures 84cm by 84cm. how much heat flows through this window per minute if the inside and outside temperture difference differ by 15 degree Celceus
The power output of a sound system is increased by a factor of 25. By what factor should you adjust your distance from the speakers
A device used in radiation therapy for cancer contains 0.83 g of cobalt-60 (59.933 819 u). The half-life of this isotope is 5.27 yr
95.8 kg of ice is melted into water then raised to a temperture of 325.8 K. How much energy is needed to complete this process?
A particle state is represented by the following wave function
The primary coil of a transformer has 237 turns; secondary coil has 2100 turns. An alternating current is sent through the primary coil. The emf in the primary is 25 V. What is the emf amplitude in secondary.
A nuclear power plant produces an average of 4.90 × 103 MW of power during a year of operation. Find the corresponding change in mass of reactor fuel
A handball of mass 0.10 kg, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19m/s. What is the change in the momentum of the ball.
Marta flies past you at 78% of the speed of light, traveling in a spaceship that would measure 50 meters from end to end if it were at rest in your reference frame. If you measure the length of her spaceship as it goes by, how long will it be from ..
A 5.17-g bullet is moving horizontally with a velocity of +340 m/s, where the sign + indicates that it is moving to the right, What is the velocity of the second block after the bullet imbeds itself
A ring is fitted loosely (with no friction) around a long, smooth rod of length L = 0.561 m. The rod is fixed at one end, and the other end is spun in a horizontal circle at a constant angular velocity of ? = 3.57 rad/s.
When one mole of C6H6 is burned, 3.27 MJ of heat is produced. When the heat from burning 7.77 g of C6H6 is added to 5.69 kg of water at 21.0°C, what is the final temperature of the water?
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