You wire a real battery to a R1 = 42 Ω resistor and find that the output voltage between its terminals is V1 = 8.6 V. You disconnect it from the first resistor, wire it to a R2 = 720 Ω resistor, and find that its output voltage is V2 = 9.7 V. (a) Determine the current through each resistor. I1 = I2= (b) Find the internal resistance and emf of the battery. r = Ω e m f = V

A block weighing 82.5 N rests on a plane inclined at 28.8° to the horizontal. The coefficient of the static and kinetic frictions are 0.25 and 0.12 respectively. What is the minimum magnitude of the force F, parallel to the plane, that will prevent the block from slipping? What is the minimum magnitude of F that will start the block moving up the plane? What is the magnitude of F is required to move the block up the plane at constant velocity?

A charge of -3.30 nC is placed at the origin of an x y-coordinate system, and a charge of 1.55 nC is placed on the y axis at y = 4.30 cm .

A. If a third charge, of 5.00 nC , is now placed at the point x = 3.30 cm , y = 4.30 cm find the x and y components of the total force exerted on this charge by the other two charges.

B. Find the magnitude of this force.

C. Find the direction of this force. (in degrees below the +x-axis)

The sun is 150,000,000 km from earth; its diameter is 1,400,000 km.For a science project on solar power, a student uses a 24-cm-diameter converging mirror with a focal length of 47 cm to focus sunlight onto an object. This casts an image of the sun on the object. For the most intense heat, the image of the sun should be in focus.

a. Where should the object be placed?

b. What is the diameter of the image?

c. The intensity of the incoming sunlight is 1050 W/m2. What is the total power of the light captured by the mirror?

d. What is the intensity of sunlight in the projected image? Assume that all of the light captured by the mirror is focused into the image.

Please explain every part neatly and clearly, I am having a very difficult time finding a clear answer and process for this on chegg(or on my own). Thank you!

1. Each part of this question covers a key concept. Each requires at most a few sentences to answer; some are much shorter. Please be concise.

   1. (a) What does the Maxwell-Boltzmann distribution describe for a gas in thermal equi- librium? Suppose a gas in a closed cylinder is kept at constant temperature while being compressed to half its original volume. What effect does this compression have on the pressure that the gas exerts on the walls of the cylinder? What would happen if the same amount of compression occurs at a higher (but still constant) temperature?

   2. (b) Two planets have identical diameters but differ in mass by a factor of 20. Which planet has the larger escape velocity? By what factor?

   3. (c) Jeopardy Question. Give a question with the following answer: This occurs when compression due to gravity is balanced by a pressure gradient, which creates a force in the opposite direction

Sam, whose mass is 75kg , takes off across level snow on his jet-powered skis. The skis have a thrust of 220N and a coefficient of kinetic friction on snow of 0.1. Unfortunately, the skis run out of fuel after only 11s .

a) what is Sam's top speed?

b) How far has Sam traveled when he finally coasts to a stop?

How do you calculate the time required to change the temperature of a room by 10C by radiation? Given: Emissivity: 0.91 A: 2.0 T2: 292.5K T1:282.4K

I just need to know what formula to use in order to calculate the time.

Engine Cycles

a. Write a description of an 'engine cycle'. Use figures, grabs and/or image to help support your description. Cite and material that used to prepare this description.

b. Provide a real world example of an engine cycle(that is NOT a car, truck, lawn mower or other engine). Describe the transfer of energy through the cycle.

Would the voltage of a battery in circuit be larger or smaller than the voltage of a battery out of circuit? Why?

A Ferris wheel with a diameter of 35.0 m in , starts from rest and achieves its maximum operational tangential speed of 2.20 m/s in a time of 15.0 s. a.) what is the magnitude of the wheel

A proton moving to the right at 6.2 × 10^5 ms^-1 enters a region where there is an electric field of 62 kNC^-1 directed to the left. Describe qualitatively the motion of the proton in this filed. What is the time taken by the proton to come back to the point where it entered the field? (Use the standard values of the mass and charge of a proton) Be as descriptive as possible, please!

In the vertices of a square of side 2x10 ^ -7 four protons are placed. A fifth proton is initially perpendicular to the square at its center at a distance of 2x10 ^ -9 m from it. Calculate (a) the minimum initial velocity of the fifth proton you need to get to the center of the square (b) your initial and final accelerations. (c) graph the potential energy of the proton as a function of its distance from the center of the square.

Find the radius of an electron's orbit when it moves perpendicular to a magnetic field of 0.46 T with a speed of 6.29×10⁵ m/s .

Express your answer using two significant figures.