Sunday
May 19, 2013

# Posts by olga

Total # Posts: 67

physics
The earth exerts a downward force of 850 N on a veteran astronaut as he works outside the space shuttle. What force (if any) does the astronaut exert on the earth?

physics
You’re sanding a table. You must exert a force of 23 N on the sandpaper to keep it moving steadily across the table’s surface. You slide the paper back and forth for 23 minutes, during which time you move it 1090 m. How much work have you done?

physics
You’re using a wedge to split a log. You are hitting the wedge with a large hammer to drive it into the log. It takes a force of 3500 N to push the wedge into the wood. If the wedge moves 0.2 m into the log, how much work have you done on the wedge?

physics
The builders of the pyramids used a long ramp to lift 20000-kg (20-ton) blocks. What is the gravitational potential energy of one of the blocks if it’s now 79 m above the ground?

physics
A sprinter can reach a speed of 12 m/s in 0.96 s. If the sprinter’s acceleration is constant during that time, what is the sprinter’s acceleration?

physics
29.2m/s= t*.40m/s^2+0 t=29.2m/s/.40m/s^2 t=73s

physics
If your car accelerates from rest at a steady rate of 4 m/s2, how soon will it reach 81 km/h (50.3 mph or 22.5 m/s)?

physics
If your car has a mass of 770 kg, how much force is required to accelerate it forward at 4.98 m/s2?

math
74

chemistry
A 25g sample of a compound composed of Carbon, Hydrogen, and Oxygen was combusted. 55grams of Carbon Dioxide and 30 grams of water were collected. A) What is the empirical formula of the compound? B) If the compound has a molar mass of 120g what is the molecular formula?

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