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Question1
A ball drops from rest from an unknown height h. The time it takes for the ball to hit the ground is measured to be 2.3 +or - 0.2s. The height is related to this time by the equation h = 1/2 g t^2 where g = 9.81m/s2. Suppose that value for g carries no uncertainty and compute the height h including its uncertainty.
Question2
A cylindrical wire of radius 2.0mm carries a current of 2.5 A. The potential dissimilarity between points on the wire that are 46m apart is 3.7 V.
(a) What is electric field in the wire?
(b) What is resistivity of the material of which the wire is made?
A student begins at rest and then walks north with an average speed of v1=0.85 m/s. What was the student's overall average velocity, in m/s, for the trip assuming the student spent equal times at speeds v1 and v2
A loudspeaker at a rock concert generates 10-2 W/m2 at 18 m at a frequency of 1 kHz. Suppose that speaker spreads its energy uniformly in all directions. What is the intensity level at 18.00m.
A copper block is suspended from a wire, as in part 1 of the drawing. A container of mercury is then raised up around the block, Find the ratio of the fundamental frequency of the wire in part 2 to the fundamental frequency in part 1
General relativity says that the total orbital energy of the binary system consisting of two neutron stars will decrease over time through the emission of gravitational waves. If this happens slowly sufficient that the orbit stays circular, response ..
on a windy day, a person on a cart (combined mass m of 70kg) begins at the top of a hill 10m hihg traveling at 3m/s, At what distance from the bottom of the hill did the car stop
A baggage handler throws a 20kg suitcase along the floor of an airplane luggage compartment with a speed of 1.2 m/s. What is the suitcase's coefficient of kinetic friction on the floor
The Sun revolves around the center of the Milky Way Galaxy at a distance of about 30,000 light-years from the center, how many stars would there be in our Galaxy
Which of the following has the most mass: air in a 6516-ft3 house (density = 1.16 kg/m3), a 248-N bag of cement, a 75.8-kg person or a 9.71-lb cat, What is the mass of the cat
A circular loop of wire with 10 turns, radius 0.241 m and resistance 0.235 Ohms is connected to a 13.1 V power supply. find The magnetic field at the center of this loop
after boarding an airpalne you carry your 14.0 kg suitcase down the aisle to your seat a distance of 24.0 m
Calculate the per capita energy use for China and India. The populations of each country should be obtained from reliable sources. Express your final answer in units of kcal per day per person.
Flight to Mars. To send a satellite from Earth to Mars, a rocket must accelerate the satellite until it is in the correct elliptical orbit around the sun. Calculate the time for the satellite's journey
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