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A motorist drivesnorth for 35.0 min at 85.0 km/h and then stops for 15.0 min. Hethen continues north,traveling 130 km in 2.00 h.
a) what is his total displacement?
b) what is his average velocity
A large helicopter is used to lift a heat pump to the roof of a new building. How much force must the air exert on the helicopter
The track for a racing event was designed so that riders jump off the slope at 30 angle, from a height of 5 ft. Determine the maximum height he attains
When you bend your knee, the quadriceps muscle is stretched. What size force does the femur exerts on the kneecap if the tendons are oriented as in the figure and the tension in each tendon is 60 {\rm N}
Due to its spin, the electron possesses a magnetic moment ?B. Treating the conduction electrons in a metal as a free electron gas, Evaluate this expression at zero temperature
If 0.2 kg of chai tea at 90 degrees C is poured into a 0.3 kg cglass cup(C=840 J/kg K) at 20 degrees C, what is the final temperature of the chai tea
Zorch, an archenemy of Superman, decides to slow the earth's rotation to once per 31.0 h by exerting an opposing force at the equator and parallel to it. find how long Zorch must push with this force to accomplish his goal
An ambulance is generating a siren sound at a frequency of 2,000 Hz. The velocity of sound is 345.0 m/s. what is the frequency of the siren perceived by the observer
Consider a hot-air balloon. The deflated balloon, gondola, and two passengers have a combined mass of 315 kg, Then find the temperature of the air inside the balloon
Two large, parallel, conducting plates are 26cm apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electrostatic force of 2.8 x10-15 N acts on an electron placed anywhere between two plates.
When illuminated with light of 600nm (6*10^-7 m), the first dark fringe produced by a single slit lies a distance of 1.4 cm from the center of the screen placed 3.0 m from the slit
A step-up transformer for long-range transmission of electric power is used to create a potential difference of 1.0921 x 10^5 V across the secondary. How many turns are in the primary
Two stars orbit about their common center of mass. One of the stars has mass m1 and moves in a circular orbit at a distance a from the center of mass. What is the ratio of the orbital periods
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