Hendy

In order to verify a shiny stone as being a gem stone (in this case sapphire) the angle of refraction is measured and then the index of refraction is calculated. Using the following picture and data, what is the index of refraction for this shiny object? n_air = 1, angle of incidence 50.0°, angle of refraction 25.6°

Light travels from one material with a refractive index (n1 = 1.5) to another material with a refractive index (n2=1.7). If it strikes the surface at a 45° angle (also 45° to normal) What is the resulting angle (from the normal) in the second material?

It has been observed that a certain star (S2) in the Sagittarius A* (meaning in the direction of the constellation Sagittarius) is orbiting a supermassive black hole. If the period of S2 is 16year and the distance between the two is 1.79e13m. What is the mass of this black hole? 

A. Higher

B. Lower

C. No different

-

I think A but I'm not sure.

Thanks.

the popular show, The wheel of Fortune, a contestant gives the wheel an initial angular

velocity of -5.95 rad/s and the wheel stops after 5.8s of constant acceleration. Determine

the panel (e.g. $600 or bankrupt) that the yellow pointer will be on when the wheel stops

Two kids sit on a seesaw of length 4.2m, balanced at its center. Sarah sits at the far end

and has a mass of 50.kg. The Anna is 75kg. They seesaw for a while (having a grand time)

then decide to balance themselves. Then Sarah is given a bag of oranges weighing 3.0kg,

and the seesaw rotates out of balance. When the Anna is given a bag of apples, balance is

still not restored. She has to place the apples 0.33m behind her for them to be balanced

again. What is the weight of the bag of apples?

A can filled with sand has a mass of 0.65kg is swung overhead in a horizontal circle of

radius 0.70m at a constant rate of 2.5 revolutions per second. Find the angular momentum

of the can.

Your computer hard drive rotates at a rate of 10,000rpm. If I turn off the computer and it takes 17s for it to come to a complete stop, what is the angular acceleration of this motion?

 2x + y - 3z = 4

 4x + 2z = 10

-2x + 3y - 13z = -8

A. Infinitely Many Solutions

B. No Solution

C. One Solution

x - y + 2z = 22

   3y - 8z = -9

             z = -3

A goalie for the newly-created sport of "ice soccer" stops a soccer ball skidding along the ice without rolling, over a distance of 0.8 m. The ball comes to a complete stop from it’s initial speed of 5.68m/s. What force must the goalie's hands make with the 0.500 kg ball? Ignore friction.

When playing shuffleboard, a player exerts a constant force of 2.7 N on an initially stationary puck, at an angle 55° below the horizontal. If the player pushes the puck for 1.5 m, how fast is the puck moving when it is released? The mass of a puck is 0.49 kg. Ignore the force of friction.

Early one February morning you go outside to build a snow man. You make a 3.8kg snowball and lift it to a height of 1.25m, then carry it 25m on level ground with a force of 1.0N to your snowman and then lift it up the rest of the way to set as the head of a 2.5m snowman. How much work do you do on the snowball as you transport it and position it on your masterpiece?

It takes a force of 1250N to keep a car moving with constant speed up a slope. If the engine delivers 50.0hp (3.73x104 W) what is the speed of the car?

When your sled starts down from the top of a hill, it hits a frictionless ice slick that extends all the way down the hill. At the bottom, the ground is dry and level. The effective coefficient of friction between the sled runners and the ground is 0.62. If the hill is 50 m high, how far will your sled travel once it reaches the bottom?