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A car has an average speed of 80.0 lm/h for one hour, then an average speed of 90.0 km/h for two hours during a three-hour trip. What was the average speed for the three-hour trip?
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At an open-air concert a person sits at a location that is 7m and 9.10m, respectively, from speakers at each side of the stage. A musician plays a singale 494 Hz tone, explain what the listener hears.
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A person walks 25.0 north of east for 3.00 km. How far would the person walk due north and due east to arrive at the same location?
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A 2000 kg car is slowed down uniformly from 23.0 m/s to 9.00 m/s in 5.40 s. (a) What average total force acted on the car during that time? (b) How far did the car travel during that time?
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A charge of 1.50 10-8 C lies on an isolated metal sphere of radius 16 cm. With V = 0 at infinity, what is the electric potential at points on the sphere's surface?
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What is the potential difference across a 240 ohm resistor when a current of 4.70 A flows through it?
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A sinusoidally varying driving force is applied to a damped harmonic oscillator of force constant k and mass m. If the damping constant has a value b_1, the amplitude is A_1 when the driving angular frequency equals sqaureroot {k/m}. a) In terms of A_1, what is the amplitude for the same driving...
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See attached .gif file. As the drawing shows, one microphone is located at the origin, and a second microphone is located on the +y axis. The microphones are separated by a distance of D = 1.25 m. A source of sound is located on the +x axis, its distances from microphones 1 and 2 being L1 and...
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2.) A 3.0-m-long rigid beam with a mass of 100 kg is supported at each end. An 80 kg student stands 2.0 m from support 1. How much upward force does each support exert on the beam? 3) A uniform ladder 6.0m long rests at 45 angle against a frictionless wall. If the ladder has a mass of 20kg,...
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A bottle containing 3kg of water at a temperature of 20 degrees Celsius is placed in a refrigerator where the temperature is kept at 3 degrees Celsius. How much heat is transferred from the water to cool it to 3 degrees Celsius?
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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?
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- 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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