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Two cars have collided at right angles at an intersection: Car A was eastbound; car B was northbound. The marks on the pavement show that the vehicles both moved together in the same direction immediately after the collision. That direction was at an angle of 52.3° north of east (i.e. 52.3° above the positive x-axis). It is known than car A (m = 1000 kg) was moving at 20 m/s just prior to the crash, and car B was moving at 25 m/s just prior to the crash. What was the mass of car B? Same situation as in the first part, but this time suppose you know the mass of car B (1200 kg) but not its speed prior to the collision. Find that speed.
A nuclear power plant generates waste thermal energy at a rate of 1000 MW = 1000 × 106 W. Assume the heat of vaporization of a water is 2.256× 106 J/kg. How much water must evaporate to cool the plant per day
A spaceship is observed by a stationary observer to be moving at .6 c. How fast does the laser beam travel relative to the observer
A sample contains 8.30×104 radioactive nuclei. In a time of 5 minutes, Evaluate the half life of the sample
A 0.24-kg ball on a stick is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, Find the tension in the stick
You press two flat pieces of glass together so that a very thin layer of air is trapped between them. What is the smallest spacing between the plates
A 1.50g penny with density 7170kg/m3 is released just below the surface of a pool of water. What's its initial downward acceleration
Jupiter has mass M, radius R and orbital period T, while the Sun has mass m, radius r and orbital period t. Calculate the ratio of the centrifugal acceleration to the gravitational acceleration at the equator of
Indicate the negative x direction by including a negative sign in the answer, but omit a sign for the positive x direction.
A landing airplane makes contact with the runway with a speed of 78.0 m/s and moves toward the south. After 18.5 seconds, the airplane comes to rest. What is the average acceleration of the airplane during the landing?
The moons of mars phobos and deimos are very close to the planet compared to earths moon their orbital radii are 9378 and 23459. what is the ratio od the orbital speed v of phobos to deimos
A lamp (R = 145 ), an electric heater (R = 24 ), and a fan (R = 49 ) are connected in parallel across a 121 V line. What is the current in the lamp
In an elementary-particle experiment, a particle of mass m is red, with momentum mc, at a target particle of mass 2squrt (2m) . The two particles form a single new particle (completely inelastic collision).
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