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Q1. A jeweler working with a heated 43 gram gold ring must lower the ring's temperature t make it safe to handle. If the ring is initially at 94 degrees Celsius, what mass of water at 22 degrees Celsius is necessary to lower the ring's temperature to 38 degrees Celsius?
Q2. A 1800 kg car moving at an initial speed of 35 m/s along the horizontal road skids to a stop in 58 m. (Note: When stopping without skidding and using conventional brakes, 100 percent of the kinetic energy is dissipated by friction within the brakes. With regenerative braking, such as that used in hybrid vehicles, only 75 percent of the kinetic energy is dissipated.) (a) Find out the energy dissipated by friction. (b) Find out the coefficient of kinetic friction between the tires and road.
Two speakers, one directly behind the other, are each generating a 374-Hz sound wave. What is the smallest parting distance between the speakers that will generate destructive interference at a listener standing in front of them? Take the speed of so..
An airplane is flying with a velocity of 83.0 at an angle of 25.0 above the horizontal. When the plane is a distance 114 directly above a dog that is standing on level ground, the suitcase drops out of the luggage compartment.
A pet-store supply truck moves at 25m/s north along a highway. Inside, a dog moves at 1.85m/s at an angle of 35° east of north. What is the velocity of the dog relative to road.
One mole of nickel (6E23 atoms) has a mass of 54 grams, and its density is 8.9 grams per cubic centimeter. You have a long thin bar of nickel, 2.0 m long, with a square cross section, 0.12 cm on the side.
A horse races once around a circular track in a time of 118s, with a speed of 17 m/s. What is the radius of the track? How do you go about solving this.
Two identical carts travel at 1m/s in opposite directions on a common horizontal surface. They collide head-on and are reported to rebound, each with the speed of 2m/s.
How much time is the stone in the air
A 12 kg weather rocket generates a thrust of 250 N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 560 N/m, is anchored to the ground. What is the rocket's speed while the s..
Find the distance from the positive plate
A superhero flies 147 m from the top of a tall building at the angle of 33 degrees below the horizontal. What is the vertical component of the superhero's displacement.
Compute dissimilarity in blood pressure
Assume that it takes 2.30 kg of oxygen to burn 1.00 kg of coal. (The actual amount varies with the type of the coal). What is the total mass of the reagents used in the combustion all through the 30 days.
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