(---)

(---)

- How much work is required to lift a 260- kg refrigerator to the second-story level?
How much work is required to lift a 260-kg refrigerator to the second-story level?

- A certain drag racer can accelerate from 0 to 90 km/h in 5.0 s. (a) What is its average acceleration, in g’s, during this time? (b) How far will it travel during the 5.0 s, assuming its acceleration to be constant? (c) How much time would be required to
- A 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. Find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earth’s velocity. Earth’s mass is 6.0 × 1024 kg. Show all y
- Direct-Current Circuits
A capacitor that is initially uncharged is connected in series with a resistor and an emf source with E = 100 V and negligible internal resistance. Just after the circuit is completed, the current through the resistor is 6.0×10−5 A . The time constant for the circuit is 6.0 s . A: What is the resistance of the resistor? Express your answer using two significant figures. B: What is the capacitance of the capacitor? Express your answer using two significant figures.

- an electromagnetic wave strikes a 1.3 cm2 section of wall perpendicularly. the rms value of the waves magnetic field is determined to be 6.8X10^-4. how long does it take for the wave to deliver 1850 j of energy to the wall?
- What has changed when a gardener uses a lever to lift a rock, instead of lifting it by hand?
What has changed when a gardener uses a lever to lift a rock, instead of lifting it by hand? A. Less force is applied over a longer distance. B. More force is applied over a shorter distance. C. More force is applied over a longer distance. D. Less force is applied over a shorter distance.

- The asteroid 243 Ida has a mass of about 4.0×1016 kg and an average radius of about 16 km (it’s not spherical, but you can assume it is). How long would it take for your rock to return and hit you in the back of the head?
The asteroid 243 Ida has a mass of about 4.0×1016 kg and an average radius of about 16 km (it’s not spherical, but you can assume it is). How long would it take for your rock to return and hit you in the back of the head?

- heat capacity
200 J of heat flows into a 35 g sample. If the temperature increases by 10°C, what is the heat capacity of the sample, in J/ °C?

- final equilibrium
What is the final equilibrium temperature when 10.00 grams of ice at -15.00°C is mixed with 2.00 grams of steam at 100.0°C? The specific heat of ice is 2.100 kJ/kg °C, the heat of fusion for ice at 0°C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg °C, and the heat of vaporization of water at 100°C is 2,256 kJ/k.

- final equilibrium
What is the final equilibrium temperature when 40.0 grams of ice at 0°C is mixed with 8.00 grams of steam at 120°C? The specific heat of ice is 2.10 kJ/kg °C, the heat of fusion for ice at 0°C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg °C, the heat of vaporization of water at 100°C is 2,256 kJ/kg, and the specific heat of steam is 2.020 kJ/kg °C.

- final equilibrium
What is the final equilibrium temperature when 40.0 grams of ice at 0°C is mixed with 5.00 grams of steam at 120°C? The specific heat of ice is 2.10 kJ/kg °C, the heat of fusion for ice at 0°C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg °C, the heat of vaporization of water at 100°C is 2,256 kJ/kg, and the specific heat of steam is 2.020 kJ/kg °C.

- Is the work required to accelerate the car from 50 km/h to 150 km/h equal to 2W, 3W, 8W, or 9W?
- temperature and heat
What is the final equilibrium temperature when 40.0 grams of ice at 0°C is mixed with 8.00 grams of steam at 120°C? The specific heat of ice is 2.10 kJ/kg °C, the heat of fusion for ice at 0°C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg °C, the heat of vaporization of water at 100°C is 2,256 kJ/kg, and the specific heat of steam is 2.020 kJ/kg °C. Select one: a. 41.67°C b. 38.76°C c. 50.22°C d. 32.55°C

- A cable lifts a 1200-kg elevator at a constant velocity for a distance of 35 m. What is the work done by (a) the tension in the cable and (b) the elevator's weight?
- You (height of your eyes above the water, h = 1.70 m ) are standing 2.00 m from the edge of a 2.50-m-deep swimming pool (Figure 1) . You notice that you can barely see your cell phone, which went missing a few minutes before, on the bottom of the pool. T
- Distilled water is a conductor of electricity or not?
H

- electricity
Distilled water is a conductor of electricity or not?

- Two protons (each with rest mass M = 1.67 x 10-27kg) areinitially moving with equal speeds in opposite directions. Theprotons continue to exist after a collision that also produces an0 particle. The rest mass n0 is m = 9.75 x10-28 kg (a) If the two proton
- Kenny Klutz dropped his physics book off his aunts high rise balcony it hits the ground below 1.5 sec. later ignore Air resistance.
With what speed does it hit the ground?