A small object moves along the xx-axis with acceleration ax(t)ax(t) = −(0.0320m/s3)(15.0s−t)−(0.0320m/s3)(15.0s−t). At tt = 0 the object is at xx = -14.0 mm and has velocity v0xv0x = 8.70 m/sm/s.

What is the xx-coordinate of the object when tt = 10.0 ss?

Express your answer with the appropriate units.

A mass m slides down a frictionless ramp and approaches a frictionless loop with radius R. There is a section of the track (between the ramp and the loop) with length 2R that has a kinetic friction coefficient of 0.5. From what height h must the mass be released to stay on the track? No figure.

1.5R 2.5R 3.5R 4.5R or 5.5R

In an experiment on the photoelectric effect, a beam of monochromatic light is aimed at a nickel-plated cathode. A scientist uses mathematical formulas to calculate the maximum speed of the electrons that the cathode releases. Which constant most limits the precision of the calculation?

Which example illustrates a behavior called “photoconductivity”?

A metallic film conducts electricity when an electric potential is applied across it.

A cathode emits electrons when it is struck by white light, which is a mixture of light of many frequencies.

A film with metallic properties becomes a better electrical conductor when light is shined upon it.

A cathode emits electrons when monochromatic light of a certain frequency strikes it.

Parasitic power theft:

A power line running East-West at 150kVAC carrying a 75 MWatt load is 10 meters overhead. A thief makes a 100 turn loop of insulated copper wire around a plastic garbage can with a 70cm diameter. The voltage generated in this coil is used to charge batteries for a fish-finder, lights and radio in his fish hut. The battery charger is electrically equivalent to a 5 ohm resistor.

a) What orientation of the garbage pail winding will allow the greatest rate of electricity theft?

b) Determine the voltage generated across the battery charger.

c) Residential power costs $0.10/kWh. What is the value of the power stolen per day.

d) Why would metal can be a bad choice?

e) Above the indication is that the other wire for the AC power transmission is very far away. In fact they both hang from the same structure. If each wire carries a 100amp current and they are separated by 50cm, determine the force per unit length on the wires

A 100 g lead ball at a temperature of 100◦C is immersed in 300 g of water with the temperature 20◦C contained in an insulated boiler whose heat capacity can be neglected. What will be the mixing temperature? What entropy change does the ball produce? What entropy change does the water bring?What will be the total entropy change?

A 0.10 kg heavy steel ball with a temperature of 200◦C is thrown into a lake with temperatures 20◦C. Which is the entropy change for the ball, for the sea and for the whole system (universe)

A typical American household uses 26.5 kW-hour of electricity per day, and that electricity is mostly supplied by fossil fuels. If we wanted to instead power a house by solar panels, which receive on average 370 W/m2 from the Sun each day and are 15.7% efficient (fraction of solar energy converted into useable electrical energy), what area of solar panels is needed to power an average American home?

Suppose that a molecular ion with charge -10e is embedded within the 5.0-nm-thick cell membrane of a cell with membrane potential -70 mV.

What is the electric force on the molecule?

Summarizing metaphysics in film. Provide a summary and explain the metaphysical concepts found in the film, the Sixth Sense.

One of the harmonic frequencies of tube A with two open ends is 836 Hz. The next-highest harmonic frequency is 912 Hz. (a) What harmonic frequency is next highest after the harmonic frequency 228 Hz? (b) What is the number of this next-highest harmonic? One of the harmonic frequencies of tube B with only one open end is 2940 Hz. The next-highest harmonic frequency is 3220 Hz. (c) What harmonic frequency is next highest after the harmonic frequency 3780 Hz? (d) What is the number of this next-highest harmonic?

Why can’t the human body sense magnetic fields in our bodies when neurons “fire”

1 For the following questions consider a compound of calcium and chlorine.

a What type of bond do calcium and chlorine form?

b Describe how this bond forms.

c What is the chemical formula for the compound? Explain.

2 For the following questions consider a water molecule, H₂O.

a What type of bond is formed between the oxygen and the hydrogen atoms?

b Describe how these bonds form.

c Explain why there are two hydrogen atoms for each oxygen atom.

3 For the following questions consider a piece of copper wire.

a What type of bond is formed between the copper atoms?

b Describe how these bonds form.

c Explain why copper is a good electrical conductor.

Why do astronomers think there are two basically different types of gamma-ray burst?

A tube at room temperature which is 0.680 m long is open on both ends. Which frequencies of sound will resonate in the tube?

The tube is then covered on one end. Which frequencies of sound will resonate in the tube now?

e) lowest frequency


f) 2nd lowest frequency

g) 3rd lowest frequency

h) What is the highest frequency of audible sound that will resonate in this tube?

1.A 15 pF capacitor is charged to 1 kV and
then removed from the battery and connected
in parallel to an uncharged 65 pF capacitor.
What is the new charge on the second ca-
pacitor?
Answer in units of nC

2.What is the new charge on

3.Find the change in energy.
Answer in units of ?J

You plan to take a trip to the moon. Since you do not have a traditional spaceship with rockets, you will need to leave the earth with enough speed to make it to the moon. Some information that will help during this problem:

mearth = 5.9742 x 1024 kg

rearth = 6.3781 x 106 m

mmoon = 7.36 x 1022 kg

rmoon = 1.7374 x 106 m

dearth to moon = 3.844 x 108 m (center to center)

G = 6.67428 x 10-11 N-m2/kg2

1) On your first attempt you leave the surface of the earth at v = 5534 m/s. How far from the center of the earth will you get?

2) Since that is not far enough, you consult a friend who calculates (correctly) the minimum speed needed as vmin = 11068 m/s. If you leave the surface of the earth at this speed, how fast will you be moving at the surface of the moon? Hint carefully write out an expression for the potential and kinetic energy of the ship on the surface of earth, and on the surface of moon. Be sure to include the gravitational potential energy of the earth even when the ship is at the surface of the moon!

(Please inlude step-by-step solution or even an online video link that can teach me this as well)