1. A 3.0cm tall object is located 5.0cm from a converging lens that has a focal length of 10.0cm. What is the magnification of the image?

a. M= 0.500

b. M= -0.500

c.M= 2.0

d. M= -2.0

e. none of the above

2. A bird is flying above the water when it spots a fish a few meters ahead in a direction about 30 degrees below the horizontal (the bird is not directly over the fish). The bird is hungry, and dives towards the water. In order to catch the fish, the bird should aim ____

a. above where the fish appears.

b. below where the fish appears.

c.precisely where the fish appears.

3.  A convex mirror forms an image of a real object. Which of the following statements is true?

a.The image is real, upright and larger than the object.

b. The image is real, upright, and smaller than the object.

c. The image is virtual, upright and larger than the object.

d. The image is virtual, upright and smaller than the object.

e. The image is virtual, upright, and can be larger or smaller than the object

A circular steel wire 3.00 m long must stretch no more than 0.25 cm when a tensile force of 860 N is applied to each end of the wire. What minimum diameter is required for the wire? I just really need a clear explanation of how to figure out Young's Modulus of steel.  

A coil is wrapped with 226 turns of wire on the perimeter of a circular frame (of radius 70 cm). Each turn has the same area, equal to that of the frame. A uniform magnetic field is directed perpendicular to the plane of the coil. This field changes at a constant rate from 22 mT to 61 mT in 79 ms. What is the magnitude of the induced average E in the coil, over the time interval 79 ms during which the field changes? Answer in units of V.

A 5 kg pully has a string round around it and a force of 1.0 N pulls down on the string. The pully is frictionless, 10 cm in radius, and is a uniform disk. The pully is initially at rest.

A) What is the torque of the pully?

B) What is the angular acceleration of the pully?

C) How many times will the pully rotate in 3.0 seconds?

D) What will the pully's angular velocity be after 3.0 seconds?

A 2.00 m long metal wire is formed into a square and placed in the horizontal xy-plane. A uniform magnetic field is oriented 30 degrees above the horizontal with a strength of 0.344 T. What is the magnetic flux through the square due to this field?

Two identical metal spheres attract each other with a force of 7.00 × 10−6 N when they are 3.00 cm apart. The spheres are then touched together and then removed to the original separation where now a force of repulsion of 2.00 × 10−6 N is observed. What is the charge on each sphere after touching and before touching?

A home run is hit in such a way that the baseball just clears a wall 16 m high, located 122 m from home plate. The ball is hit at an angle of 33° to the horizontal, and air resistance is negligible. (Assume that the ball is hit at a height of 1.0 m above the ground.)

What is the initial speed of the ball?

How long does it take the ball to reach the wall?

What is the velocity of the ball (x and y-component)?

What is the speed of the ball when it reaches the wall?

A stopper on a string is swung horizontally over a student’s head. The other end of the string is connected to a 0.200 kg mass that remains stationary. If the stopper completes 20 revolutions in 5.5 seconds with a radius of 0.75 m, then what is the mass of the stopper? Hint: In order to be in equilibrium, the vertical weight of the mass in N, needs to equal the centripetal force of the stopper. To find the velocity of the stopper, you will need to multiply the circumference it would travel by how many revolutions it has made, and divide that by the time

Two small loudspeakers emit sound waves of different frequencies equally in all directions. Speaker A has an output of 1.30 mW, and speaker B has an output of 1.90 mW. Two speakers A and B are represented as points which serve as the centers of concentric circles representing sound waves emanating from the speakers. The concentric circles about speaker A are spaced more closely together than the concentric circles about speaker B. The points lie along a horizontal line, and speaker A is 5.00 m to the left of speaker B. A vertical line is drawn that intersects the horizontal line at a distance of 3.00 m from the left speaker and 2.00 m from the right speaker. Point C lies along this vertical line at a distance of 4.00 m above the point of intersection. (a) Determine the sound level (in decibels) at point C in the figure if only speaker A emits sound. (Enter your answer to at least one decimal place.) dB (b) Determine the sound level (in decibels) at point C in the figure if only speaker B emits sound. (Enter your answer to at least one decimal place.) dB (c) Determine the sound level (in decibels) at point C in the figure if both speakers emit sound. (Enter your answer to at least the nearest dB.) dB/Users/crystaldawnmcclendon/Desktop/14-p-064.gif

Suppose a solid cylinder of radius R is caused to rotate with a torque of known magnitude about an axis through its center. The same torque is then applied to a hollow cylinder of outer radius R and inner radius r. If their masses are equal, which object has the greater angular acceleration?

A. The solid cylinder has greater angular acceleration.

B. Both cylinders have the same acceleration

C. The hollow cylinder has a grater angular acceleration

A 20 mW 360 nm laser is incident on a metal anode. The metal in the anode has a work
function of 1.80 eV.
a) What voltage must be applied to completely stop the photo-electrons?
b) In the absence of an applied voltage, what current would be measured? assuming
i) all photons in the laser produce a photo-electron and
ii) all photo-electrons reach the cathode
c) Why are these unrealistic assumptions?
d) What is the deBroglie wavelength of the emitted electrons?

Give two examples explaining where using conservation of energy to solve a problem is easier than other the methods. Explain how you would use energy to solve the problem and why it is easier. 75-150

Explain in your own word the concepts of viscous damping, coulomb damping and stiffness force in a vibration system.

1. A 0.4 kg ball hits the ground (vertically) at a speed of 6 m/s, bouncing back in the opposite direction at 4 m/s. Calculate the magnitude of the impulse provided by the ground to the ball.

A. 2 Ns

B. 10 Ns

C. 4 Ns

D. 0.8 Ns

2.Calculate the recoil speed of a 1.4 kg rifle shooting 0.006 kg bullets with muzzle speed of 800 m/s

A. 3.43 m/s

B. 571 m/s

C. 1.22 m/s

D. 6.42 m/s

3. A 20 kg cart moving at 10 m/s bumps from behind an 80 kg cart initially moving at 2 m/s in the same direction. The two carts stick to each other after the collision. Calculate the speed of the carts after they collide.

A. 8.4 m/s

B. 3.6 m/s

C. 7.6 m/s

D. 0.4 m/s

4. A 40 kg cart moving from South toward North at 6 m/s has a totally inelastic collision with a 20 kg cart moving at 3 m/s in the opposite direction. What is the speed and the direction of motion of the two carts just after the collision?

A. 3 m/s toward North

B.5 m/s toward South

C.5 m/s toward North

D.3 m/s toward South

A person with mass m₁ = 68 kg stands at the left end of a uniform beam with mass m₂ = 109 kg and a length L = 2.5 m. Another person with mass m₃ = 50 kg stands on the far right end of the beam and holds a medicine ball with mass m₄ = 8 kg (assume that the medicine ball is at the far right end of the beam as well). Let the origin of our coordinate system be the left end of the original position of the beam as shown in the drawing. Assume there is no friction between the beam and floor.

1. What is the location of the center of mass of the system?

2. The medicine ball is throw to the left end of the beam (and caught). What is the location of the center of mass now?

3. What is the new x-position of the person at the left end of the beam? (How far did the beam move when the ball was throw from person to person?)

4. To return the medicine ball to the other person, both people walk to the center of the beam. At what x-position do they end up?