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An electrical resistor is installed in a container of water to heat it. The resistor dissipates heat at a rate of 2.0 W, and the container holds 10 kg of water. How long would it take to raise the temperature of the water by 5 °C? (Note: The specific heat of water is 4.2 × 103 J/(kg °C), and 1 W is 1 J/s.) Express your answer in units of seconds, accurate to the second decimal place.
At a carnival, you can try to ring a bell by striking a target with a 9.10-kg hammer. In response, a 0.410-kg metal piece is sent upward toward the bell, How fast must the hammer be moving
A trap door, of length and width 2.35 m, is held open at an angle of 65.0° with respect to the floor. what is the torque exerted on the trap door by the rope
Find the direction of the net force exerted on the Sun. Give the direction relative to the line connecting the Sun and the Moon
An energy storage system based on a flywheel (a rotating disk) can store a maximum of 4.0 MJ, What is the moment of inertia of the flywheel
A person takes a trip, driving with a constant speed of 89.5km/h except for a 22.0-min rest stop. If the persons average speedis 77.8 km/h, evaluate how much time is spent on the trip
If all of the water's potential energy is converted to kinetic energy at the bottom of the falls and the kinetic energy goes to heat the water
A rectangular object with mass m floats in water so that a fraction ? = 0.25 is submerged. What is the density of the object
A 600nm laser hits glass with an incident angle of 30°. If the glass has and index of refraction of 1.7, determine The velocity of light inside the glass
What is the approximate temperature of the Sun at its surface? What happens to the latitude of the sunspots over the course of one solar cycle? When is the Sun's corona visible?
A box of mass 8.0 kilogram is accelerated from rest across a floor at a rate of 3.0 m/s for 6.0 s. Estimate what the net work done on the box
Two steel guitar strings have the similar length. String A has a diameter of 0.51 millimeter and is under 430 Newton of tension. Determine the ratio of the wave speeds
A standard pinion has 30 teeth, a module of 6 mm, and a 20 degree pressure angle. The velocity ratio is 0.3. a.) What is the centre distance? b.) What are the base centre diameters?
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