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A light spring with a force constant of 13N/m is connected to a wall and a 1.2-kg toy bulldozer. When the electric motor in the bulldozer is turned on, it stretches the spring for a distance of 0.45 m before its tread begins to slip on the floor.
A) Which coefficient of friction (static or kinetic) can be determined from this information? Explain.
B) What is the numerical value of this coefficient of friction?
A 15.0-kg block of ice at 0 °C melts to liquid water at 0 °C inside a large room that has a temperature of 20.0°C. Calculate the net entropy change of the system
A piece of copper wire has a resistance per unit length of 5.95 10-3 ?/m. Find the magnetic field strength at the center of the coil
A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 29.7 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 3.10 10-11 W/m2. What is intensity delivered to t..
Two sinusoidal waves, each of wavelength 5 m and amplitude 10 cm, how many nodes appear in the resulting standing wave
For a temperature increase of ?T1, a certain amount of an ideal gas requires 30 J when heated at constant volume, How much work is done by the gas in the second situation
In a dentist's office, an X-ray of a tooth is taken using X-rays that have a frequency of 8.07 multiply.gif 1018 Hz
You go to a gym and lift a 245-kg mass 2.13 m over the ground? You hold it for 10 seconds. How much work you did during the holding period
If the partial pressure of water vapor is 47 mm Hg in the lungs at 760 mm Hg pressure, what percentage of air does the water vapor constitute?
Ships A and B leave port together. For the next two hours, ship A travels at 40.0mph in a direction 55.0, What is the distance between the two ships two hours after they depart
q1. a woman is riding a boat at the speed of v when she notices a seawall straight ahead. the farthest she can lean the
Starting from rest, a 1.8 10-4-kg flea springs straight upward. While the flea is pushing off from the ground, What is the flea's speed when it leaves the ground
A strip of copper 3.0 cm wide carries a current I = 28.5 A to the right, What is the direction of the average magnetic force on the conduction electrons
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