Note: We suggest you use ray diagrams to qualitatively understand these questions. A candle 6.10 cm high is placed in front of a thin converging lens of focal length 33.0 cm. What is the image distance i when the object is placed 93.0 cm in front of the same lens?

What is the size of the image? (Note: an inverted image will have a `negative' size.)

Is the image real(R) or virtual(V); upright(U) or inverted(I); larger(L) or smaller(S) or unchanged(UC); in front of the lens(F) or behind the lens(B)? Answer these questions in the order that they are posed. (for example, if the image is real, inverted, larger and behind the lens then enter `RILB'.)

The object is now moved to 41.0 cm in front of the lens, what is the new image distance i?

What is the new size of the image?

Is the new image real(R) or virtual(V); upright(U) or inverted(I); larger(L) or smaller(S) or unchanged(UC); in front of the lens(F) or behind the lens(B)? Answer these questions in the order that they are posed. (for example, if the image is real, inverted, larger and behind the lens then enter `RILB'.)

The object is now moved to 21.0 cm in front of the lens, what is the new image distance i?

What is the new size of the image?

Is the new image real(R) or virtual(V); upright(U) or inverted(I); larger(L) or smaller(S) or unchanged(UC); in front of the lens(F) or behind the lens(B)? Answer these questions in the order that they are posed. (for example, if the image is real, inverted, larger and behind the lens then enter 'RILB'.)

The object is now moved to 6.5 cm in front of the lens, what is the new image distance i?

What is the new size of the image?

Is the new image real(R) or virtual(V); upright(U) or inverted(I); larger(L) or smaller(S) or unchanged(UC); In front of the lens(F) or behind the lens(B)? Answer these questions in the order that they are posed. (for example, if the image is real, inverted, larger and behind the lens then enter 'RILB'.)

So this is kinda a tough question, I know, but can anyone explain electrostatics to me--the general concepts I should know for an AP-preparatory, very tough Physics 2 clas? I've really been slacking through this whole unit becuase my other classes are picking up, so if anyone could explain the basics of electromagnetism, electrostatics, and circuits would be really great--test is tommorrow. Yeesh.

A 59.3-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.582 and 0.428, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?

A ball is dropped from rest from the top of a building of height h. At the same instant, a second ball is projected vertically upward from ground level, such that it has zero speed when it reaches the top of the building.

a) When do the two balls pass each other? Answer it in terms of h.

b)Which ball has greater speed when they are passing?

c)What is the height of the two balls when they are passing?

You are 9.0 m from the door of your bus, behind the bus, when it pulls away with an acceleration of 1.0 m/s2. You instantly start running toward the still-open door at 5.1 m/s.

A)How long does it take for you to reach the open door and jump in?

B) What is the maximum time you can wait before starting to run and still catch the bus?

A 2,000-kg spacecraft has an initial velocity of 8 km/s. A thruster is then fired which provides a thrust force of 10,000 N for 15 seconds. What is the velocity of the spacecraft after the thruster burn? (assume a straight path)

Calculate the angle of incidence of beam radiation on a surface located at Harrisonburg, VA at 10:30 A.M. (solar time) on February 13, if the surface is tilted 45° from the horizontal and pointed 15° west of south.

Two people, one of mass 76.4 kg and the other of mass 58.0 kg, sit in a rowboat of mass 84.4 kg. With the boat initially at rest, the two people, who have been sitting at opposite ends of the boat 2.14 m apart, now exchange seats. Friction between the boat and water is negligible. How far will the boat move?

The potassium chloride molecule (KCl) has a dipole moment of 8.90*10^-30 C·m.

(a) Assuming that this dipole moment arises from two charges, each of magnitude 1.6*10^-19 C, separated by distance d, calculate d. Correct: Your answer is correct. 5.56e-11m (

(b) What is the maximum magnitude of the torque that a uniform electric field with magnitude 6.90*10^5 N/C can exert on a KCl molecule? Correct: Your answer is correct. 6.14e-24m

(c) Suppose that the electric field of part (b) points in the +y direction. What are the possible directions of the KCL dipole moment which would result in a torque having the magnitude calculated in part (b), and having a direction of +z? Choose all that apply. -y direction , -x direction, 45 degrees CCW from +x in the xy plane, +y direction, 45 degrees CW from +x in the xy plane, +x direction

(d) Continue to suppose that the electric field of part (b) points in the +y direction. If the dipole swings from an initial orientation pointing in a direction 20.0 degrees CCW away from the -x axis to a final orientation pointing in a direction 20.0 degrees CW away from the -x axis, what is the change in the dipole's electric potential energy? The motion is entirely in the xy plane. _J?

(I got a and b correct just need c and d and how to do them)

A ski starts from rest and slides down a 24 ∘ incline 95 mlong.

Part A

If the coefficient of friction is 0.085, what is the ski's speed at the base of the incline?

Express your answer using two significant figures.

Part B

If the snow is level at the foot of the incline and has the same coefficient of friction, how far will the ski travel along the level? Use energy methods.

Express your answer using two significant figures.

A 4.90 mm -diameter copper ball is charged to +60.0 nC .

What fraction of its electrons have been removed?

A rocket of total mass m_tot = 15000 kg is initially travelling through space at 500 m/s. If it still has 11500 kg of fuel remaining, and the exhaust speed of the rocket is v(exhaust) = 3200 m/s, what is the maximum speed of the rocket?

The magnetic field inside a

5.0-cm-diameter solenoid is 2.0 T and decreasing at 3.90 T/s.

What is the electric field strength inside the solenoid at a point on the axis?
What is the electric field strength inside the solenoid at a point 2.40 cm from the axis?

Give Planck’s quantum hypothesis to describe black body radiation and derive Planck’s radiation formula

1. A “bed of nails” is a huge number of nails arranged in a piece of wood so that they all point up with the sharp points vertically upward. A person can lay down on the “bed of nails” and rest on these thousands of nails without pain or injury. Explain how this can occur.

2. A huge battleship is made of steel which has a density close to iron (almost ten times that of water) yet it can float. Explain why.

3. When a fluid flows through a constriction in a pipe, does the pressure in the fluid increase, decrease of remain constant. Explain your answer fully.

4. A large tank full of water has a nozzle which is open and water shots out of the nozzle vertically. The calculated speed of efflux of water is , which means the water fountain should rise as high as the upper surface of the water as it drains from the tank. In reality, does this actually happen. Justify your answer.

5. What is the difference between pressure and stress, if any? Explain including the units for each.

1. On a day when the atmospheric pressure is, a diver at the bottom of a fresh water lake at a depth of 26m finds a open glass tube (closed a the bottom) containing an unknown liquid (density = 5.6 g/cm3) which is 1.75 m deep. What is the absolute pressure at the bottom of the unknown liquid?

2. A rectangular shaped dam is 460m deep and 1000m wide. It holds fresh water. What is the total force due to water pressure on the dam?

3. A rectangular block of plastic (density = 3.00 x 102 kg/m³) if dimensions l = 25.0 cm, w = 15.0 cm and h = 12.0 cm is placed in water. A) What volume of the block is submerged? B) A metallic (volume 15.0 cm³) block is now placed on top of the plastic block so that the water level is exactly at the top of the plastic block. What is the density of the metallic block?

4. A fluid flows through a horizontal circular pipe that widens, making a 45^o angle with the y axis as shown below. The thin part of the pipe has radius 3 cm and the speed of the fluid is .15 m/s . If the x axis has origin at the point where the pipe widens, what is the speed of the fluid when x= 10 cm?

5. Liquid toxic waste with a density of 1752 kg/m3 is flowing through a section of pipe with a radius of 0.312m at a velocity of 1.64 m/s. a) what is the velocity of the waste after it goes through a constriction and enters a second section of pipe at a radius of 0.222m? b) If the waste is under a pressure of 850,000 Pa in the first section of pipe, what is the pressure in the second section? c) If the second section of pipe flowing horizontally turns to vertical, how high would the fluid have to rise so that the pressure decreases by 50%?

6. Water is flowing in a pipe has a diameter at point A of 8.00 cm tapering to 3.50 cm at point B. Point B is 12.0 cm below point A. The water pressure at point A is 3.20 x 10⁴ Pa and decreases by 50% at point B. Assume steady, ideal flow. What is the speed of water at point A? What is the speed of the water at point B?

7. Calculate the atmospheric pressure in pascals if the height of a mercury column in a barometer is 760 mm. The density of mercury is 13.6 x 10³ kg/m³.

8. What fraction of an iceberg is above water when floating in fresh water? Assume the density of the iceberg is 917 kg/m³.

9. A cylindrical tank of height 0.40 m is open at the top and has a diameter of 0.16m. It is filled with water (assume it to be an ideal fluid, no viscosity) up to a height of 0.16m. Find the time it takes to empty the tank through a hole of radius 5.0 x 10^-3 m in the bottom of the tank.

10. In a hydraulic lever, the cross sectional areas of the pistons are 0.250 m² and 1.00 m². We minimum amount of force that must be applied to the smaller piston to support a car of mass 1200 kg that is resting on the larger piston?