1. A water slide is constructed so that swimmers, starting from rest at the top of the slide, leave the end of the slide traveling horizontally. As the drawing shows, one person hits the water 5.00 m from the end of the slide in a time of 1.500 s after leaving the slide. Ignoring friction and air resistance, find the height H in the drawing. The answer is 11.6 m (please explain)

2. An extreme skier, starting from rest, coasts down a mountain slope that makes an angle of 25.0° with the horizontal. The coefficient of kinetic friction between her skis and the snow is 0.200. She coasts down a distance of 12.6 m before coming to the edge of a cliff. Without slowing down, she skis off the cliff and lands downhill at a point whose vertical distance is 4.30 mbelow the edge. How fast is she going just before she lands? The answer is 12 m/s. Please explain!

Compare the weight of a mountain climber when she is at the bottom of a mountain with her weight when she is at the top of the mountain. In which case is her weight larger? A)She weighs twice as much at the top B)Weighs more at the bottom C)Weighs four times as much at the top D)Both are the same E)She weighs more at the top

Please answer part d).

A string is tied between two posts sticking out of the wall. The posts are separated by 1.20 m. A 5.00-cm-long snippet of the string weighs 1.50 grams. You attach a machine to one of the posts, so that the post can vibrate up and down at a frequency set on the machine. (You can still consider the string attached to this post as a node - the machine does not create a high amplitude right at the post.)

a) You slowly turn up the frequency of the machine, and at 41.7 Hz you see the standing-wave pattern corresponding to the fundamental frequency of the system. What is the tension in the string? Express the answer in newtons (N). ANSWER: T = 300 N

b) You continue to increase the frequency of the machine, and at a higher frequency you observe that nodes form every 10 cm, and the antinodes have an oscillation amplitude of 5.2 mm. What is the frequency of this oscillation? Express the answer in hertz (Hz). ANSWER: f = 500 Hz

c) Another standing wave pattern appears when the machine is set to 167 Hz. The amplitude of the string's oscillation at the antinodes is 5.2 mm. How many antinodes n does the pattern have? ANSWER: n = 4.00

d) You keep the conditions set as they are in part C. What is the amplitude of the string's oscillation 40 cm from the post that the machine is oscillating? Express the answer in millimetres (mm).

this q has been posted before and all answers correct with exception to d

A photon of wavelength 4.18 pm scatters at an angle of 112∘ from an initially stationary, unbound electron. What is the de Broglie wavelength of the electron after the photon has been scattered?

2.1)

What is the speed of an electron that accelerates from rest starting close to the negative plate of a capacitor just before it hits the positive plate? The electric field between the plates is 300 V/m and the distance between the plates is 0.050 m.

2.2)

A charge of +2.00 nC is on the Y axis at the point (0, 2.00) m. A charge of -3.00 nC is on the X axis at the point (3.00, 0) m. Find the direction of the electric field at the Origin.

2.3)

The electric field at a point A has the components E_x = 3.00 V/m   and E_y = +2.50 V/m. Find the direction of the force acting on a charge -14.0 nC placed at the point A. Express your answer as an angle measured counterclockwise from the positive X axis.

2.4)

A charge of 3.00 nC is on the Y axis at the point (0, 2.00) m. A charge of -2.00 nC is on the X axis at the point (-3.00, 0) m. Find the magnitude of the electric field at the Origin.

Using S ≈ N k, estimate the entropy of the sun.

A box with mass 1.60 kg is being pulled across a rough surface at a constant speed with a coefficient of kinetic friction µ_k = 0.310. The pulling force has a magnitude of 12.1 N and is directed at an angle 39.7 degrees above horizontal. If the box is dragged a distance of 11.2 m, what is the total energy lost to friction? (Hint: be sure to account for the upward component of the pulling force, and note that the energy lost to friction is being compensated for by the work added by the pulling force)

Two point charges totaling 6.30 μC exert a repulsive force of 0.170 N on one another when separated by 0.490 m. What is the charge on each? Assume that the two charges are positive. Enter the smaller charge in the first box.

Q1 =

Q2 =

What is the charge on each if the force is attractive? Enter the smaller charge in the first box.

Q1 =

Q2 =

A solid cylinder, mass of 15 kg, is on a hill that is inclined at a 45 degree angle. If it rolls down the hill without slipping find:

1. The acceleration of the cylinder

2. The force of friction acting on the cylinder

3. The minimum possible coefficient of friction

Explain.

What is Bloch theorem and Kramers theorem and can you take each example showing the theorem clearly?

A 2.5 mm -diameter sphere is charged to -4.5 nC . An electron fired directly at the sphere from far away comes to within 0.34 mm of the surface of the target before being reflected.

Part A) What was the electron's initial speed?

Part B) At what distance from the surface of the sphere is the electron's speed half of its initial value?

Part C) What is the acceleration of the electron at its turning point?

write a detailed essay on energy and power. your essay should include the types of energy and the laws associated with them (500-1500 words)

please make it computer typing thanks

1 Rank the following in terms of increasing momentum:

A 10,000 kg train car at rest

A 100 kg person running at 5 m/s

A 1200 kg car going 15 m/s

A 15 kg meteor going at a speed of 1000 m/s

2 Rank the following in terms of increasing kinetic energy:

A 1200 kg car going 15 m/s

A 10,000 kg train car at rest

A 15 kg meteor going at a speed of 1000 m/s

A 100 kg person running at 5 m/s

3 Ben (55 kg) is standing on very slippery ice when Junior (25 kg) bumps into him. Junior was moving at a speed of 8 m/s before the collision and Ben and Junior embrace after the collision. Find the speed of Ben and Junior as they move across the ice after the collision. Give the answer in m/s. Describe the work you did to get the answer.  

A box of mass M is pushed a distance L across a level floor by a constant applied force P. The coefficient of kinetic friction between the box and the floor is μ. Assuming the box starts from rest, express the final velocity vf of the box in terms of M, L, P, μ, and g.