A 15μF capacitor has an initial charge of 50μC. It is discharged through an 8000Ω resistor. Find:

a) the current at 17ms;
mA
b) the charge at 17ms;
μC

c) the power loss in the resistor at 17ms.
mW

d) How long does it take for the energy in the capacitor to drop to 20% of its initial value?
ms

John is listening to a horn. When the horn and John are both at rest, the frequency of the horn is 300 Hz. If he hears a pitch of 330 Hz, there are clearly several possibilities. State which of the possibilities are correct.

1. Both can be moving and have the same speed

2. John is moving towards the horn at rest

3. The distance between John and the horn is increasing with time

4. Both can be moving in opposite directions

5. Both can be moving and have different speeds

6. John and the horn are both moving in the same direction but John is behind and moving faster than the horn

A molecule of DNA (deoxyribonucleic acid) is 2.31

A spherical steel ball bearing has a diameter of 2.540 cm at 29.00°C. (Assume the coefficient of linear expansion for steel is 11 ✕ 10−6 (°C)−1. )

(a) What is its diameter when its temperature is raised to 96.0°C? (Give your answer to at least four significant figures.) cm

(b) What temperature change is required to increase its volume by 0.800%?

A carpenter's square has the shape of an L as shown in the figure below. Locate its center of gravity. (Take

(x, y) = (0, 0)

at the intersection of d₁ and d₄. Assume

d₁ = 20.0 cm,

d₂ = 5.00 cm,

d₃ = 5.00 cm,

and

d₄ = 13.0 cm.

)

If you were shown three different interference patterns (double slit, single slit, and diffraction grating), how could you tell the difference between them?

Newton thought that light wasn't a wave because he couldn't see diffraction or interference. Imagine you are transported back in time to convince him otherwise. Write a 1-2 paragraph explanation for Newton explaining why he does not see these features despite the wave nature of light.

In a lab where the Helmholtz coil equation combined with energy conservation is used to determine the charge per mass ratio of the electron what are some random and systematic errors, how can they be minimized, and what does a vector diagram of the experiment look like? Can you explain to me how an experiment of this sort would look?

The active element of a certain laser is an ordinary glass rod 18.1 cm long and 1.16 cm in diameter. If the temperature of the rod increases by 70.3

A "seconds" pendulum is one that goes through its equilibrium position once each second. (The period of the pendulum is 2.000 s.) The length of a seconds pendulum is 0.9927 m at Tokyo and 0.9942 m at Cambridge, England. What is the ratio of the free-fall accelerations at these two locations? (Give your answer to at least 4 decimal places.) Cambridge /Tokyo =

You are holding a shopping basket at the grocery store with two 0.72-kg cartons of cereal at the left end of the basket. The basket is 0.81 m long.

Where should you place a 1.9-kg half gallon of milk, relative to the left end of the basket, so that the center of mass of your groceries is at the center of the basket?

I saw an answer for this on another question posted, but I don't think the answer was exactly what I was looking for. Can anyone help guide me in the right direction in regards to this question and its subquestions? Thanks.

The proton and electron are particles found to have equal and opposite charges to the precision that the measurements have been made so far. Why is it important that the proton and electron have exactly the same magnitude for the charge? What would happen if the proton and the electron did not have exactly equal and opposite charge? Give at least three specific examples and include at least one numerical calculation in your response.

A man in search of his dog drives first 10 mi northeast, then 39 mi straight south, and finally 1 mi in a direction 30° north of west. What are the magnitude and direction of his resultant displacement?

1. Two manned satellites approaching one another, at a relative speed of 0.250 m/s, intending to dock. The first has a mass of 4.0010³ kg , and the second a mass of 7.5010³ kg .

a) Consider the frame of reference in which the first satellite was originally at rest. Determine the momentum of the satellites before docking.

2. Determine the Kinetic energy of the satellites before docking.

3. Using conservation of momentum determine the velocity of the satellites after docking.

4. Determine the final Kinetic energy of the system.

5. What is the loss of kinetic energy in this inelastic collision (docking process)?

6. Repeat the calculation by using the frame of reference in which the second satellite was originally at rest. Explain why the change in velocity is different in the two frames, whereas the change in kinetic energy is the same in both.