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Q. A 2.5g copper penny is given a charge of -0.50 mC.
How many excess electrons make up this charge?
What is the percentage of the mass of these excess electrons to the mass of the penny?
Q. A resistor is constructed of a carbon rod that has a uniform cross-sectional area of 5.00 mm2. When a potential difference of 15.0 V is applied across the ends of the rod, the rod carries a current of 4.00 × 10-3 A. Find (a) the resistance of the rod and (b) the rod's length.
An object weighs 302 N in the air. When tied to a string, connected to a balance, and immersed in water, it weighs 220 N. When it is immersed in oil, it weighs 257 N. what is the density of the object.
The George Washington bridge, that spans the Hudson River between New York and Jersey, is 4670 feet long and is made out of steel, How much does it expand in length between winter and summer.
An osprey's call is a distinct whistle at 2200 Hz. An osprey calls whereas diving at you, to drive you away from her nest. You hear call at 2220 Hz. How fast is the osprey approaching.
The rocket fires for 10 mins , after that the asteroid is moving at 30 degrees to its original path at the speed of 18 km/h/ Find its average acceleration.
A ball is thrown from the top of a building upward at an angle of 39degrees to the horizontal and with an initial speed of 24m/s. The ball is thrown at a height of 57 m above the ground and hits the ground 98.55 m from the base of the building. Wh..
A small steel ball bearing with a mass of 11g is on a short compressed spring. When aimed vertically and suddenly released, spring sends the bearing to a height of 1.21 m. compute the horizontal distance the ball would travel if the same spring we..
A 60kg bicyclist rides his 7.8kg bicycle with a speed of 16m/s. How much work must be done by the brakes to bring the bike and rider to a stop.
What is tension in each of the cables
If a 200 lb bungee jumper jumps from a bridge 150 ft and touches the top of the river. If the cord absorbs 14 percent of the energy how far will be man be at the Top of the next bounce from the river bottom.
A ranger in a national park is driving at 24.0 mi/h when a deer jumps into the road 270 ft ahead of the vehicle. After a reaction time of t, ranger applies the brakes to produce an acceleration of a = -9.00 ft/s2. What is the greatest reaction tim..
A 16 cm x 16 cm square loop of wire lies in the xy-plane with its bottom edge on x-axis. The resistance of the loop is 0.490 ohms. A magnetic field parallel to the z-axis is given by B= 0.830 y^2 t, where B is in tesla, y in meters, and t in seconds...
A 100 arrow is shot vertically from a bow whose efficient spring constant is 500. If the bow is drawn 75 before shooting the arrow, to what height does the arrow rise .
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