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A battery charger is connected to a dead battery and delivers a current of 6.5 A for 3.5 hours, keeping the voltage across the battery terminals at 12 V in the process. How much energy is delivered
Suppose that you want to freeze 1 kg of water for a party, and only have 5 minutes to do it. What is the change (including the sign) in entropy in the water per second in J/(Ks)?
Treat the coffee as though it were pure water and neglect energy exchanges with the environment. The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg. The density
A 5 kg fish swimming 2 m/s swallows an absent minded 1 kg fish swimming toward it at a velocity that brings both fish to a halt immediately after lunch. What is the velocity v of the smaller fish be
The radius of the turntable is 2.70 m, and its moment of inertia about the axis of rotation is 86.0 ,{rm kg} cdot {rm m}^{2}.
A nuclear power plant has a core temperature of 5000 K, and a cooling tower temperature of 373 K. How much water is evaporated per second at the cooling towers?
Standing at a crosswalk, you hear a frequency of 510 Hz from the siren of an approaching ambulance. After the ambulance passes, the observed frequency of the siren is 436 Hz. Determine the ambulance
To see why, calculate the average force a bumper would have to exert if it brought a 1200-kg car (a so-called compact model) to a rest in 15 cm when the car had an initial speed of 2 m/s (about 4.5
You drop a stone from a position of rest. The acceleration of gravity is 9.8 m/s2 . How far will it fall vertically in the first 9 s? Answer in units of m.
What is the resistance of the bulb? (b) If the battery becomes weak and the voltage drops to 1.2 V, how would the current change?
A 0.640-m long gas column is open at one end and closed at the other. What is the fundamental resonant frequency of the air column if the speed of sound in the air is 340 m/s?
The coefficients of friction between the block and the disk are 0.75 (static) and 0.64 (kinetic) while those for the penny and the block are 0.520 (static) and 0.450 (kinetic). What is the maximum r
An observer detects two explosions,one that occurs near her at a certain time and other that occurs 2.00ms later 100 km away. another observer finds that the two exlosions occur at the same place. w
A loop of wire is situated inside a large solenoid, with the plane of the loop initially perpendicular to the axis of the solenoid. the current flowing through the solenoid is decreasing with time
A cube of ice is taken from the freezer at -8.5°C and placed in a 96 g aluminum calorimeter filled with 314 g of water at room temperature of 20°C. The final situation is observed to be all
Using the definition found in the text - define ‘Reliable' B) Using the definition found in the text - Define Valid. C) Is this test reliable? D) Is it valid?
He insists on throwing 25.0 { g} rocks at your new 2.25 { kg} light fixture hanging by a 26.0 cm} wire from the ceiling of your porch. If each rock strikes the fixture traveling at 10.0 { m/s}, how
A hot-air balloon is rising straight up with a speed of 4.4 m/s. A ballast bag is released from rest relative to the balloon when it is 7 m above the ground. How much time elapses before the ballas
Two students use a 40 HZ tape timer to measure the time of fall of a ball from a height. they count 239 dots on the tape. what is the time of fall of the ball?
A vertical spring with a spring constant of 480 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.15-kg block is dropped from rest. It collides with and sticks to
Two electric dipoles with charges +/-Q on the left attached to each to other by a rigid rod, and the two charges on the right are also rigidly attach to each other, find the electric force?
An athlete whose mass is 85.0 is performing weight-lifting exercises. Starting from the rest position, he lifts, with constant acceleration, a barbell that weighs 580 . He lifts the barbell a dista
A 1.00 g lead bullet at 24.0°C is fired at a speed of 280 m/s into a large block of ice at 0°C, in which it becomes embedded. What quantity of ice melts?
A uniform cylinder with radius 20 cm has been attached to two cords and the cords are wound around it and hung from the ceiling. the cylinder is released from rest and the cords unwind as the cylind
A car with a rectangular size of 6.00 m by 3.00 m is traveling along a dry gravel roadway sloping downward at 7.0°. Determine the electric flux through the bottom of the car.