Question 4

The sea water (RD=1.03) level on one side of a sea lock is 3.5m high.

1. Determine the force on the 5m wide sea lock and also the location of this force from the bottom.
2. If a 300mm diameter hole is cut out and a cover plate bolted in place, determine the force on the cover plate and also the location to the center of the hole. The tops of the hole is 2.35m below the level of the sea water.

In your own words, describe the evolution of the Sun (from interstellar cloud to white dwarf). A H-R diagram must be drawn, and key aspects must be described in detail. You may write your answer in point form.

A 10.0 pF (picofarad - pico = 10^-12) is connected to a 12.0 V power supply. What is the energy stored in this capacitor?

mearth=5.9742×10^24kg
rearth=6.3781×10^6 m
mmoon=7.36×10^22kg
rmoon=1.7374×10^6m
death to moon=3.844×10^8m center to center
G=6.67428×10^-11

1700 kg satellite is orbiting the Earth in a circular orbit with an altitude of 1700 km
1) how much energy does it take to get it to this altitude
2)how much kinetic energy does it have once it has reached this altitude
3)what is the ratio of this change in potential energy to change in kinetic energy
4)what would this ratio be if the final altitude of the satellite was 4700 km
5)what would be this ratio if the final altitude was 3185 km?

Describe how to turn a negative photoresist into a positive.

Describe how direct and indirect digital detectors create an image. In what way are they different?

Two stationary positive point charges, charge 1 of magnitude 3.85 nC and charge 2 of magnitude 1.65 nC , are separated by a distance of 48.0 cm . An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges. Part A What is the speed vfinal of the electron when it is 10.0 cm from charge 1?

On planet Jerousek, which has almost no atmosphere, the acceration due to gravity is 10.5 m/s2m/s2.A projectile is launched from the top of a steep hill with an initial velocity of 30 m/s at an angle of 43º from the horizon. The projectile takes 14 s to hit the ground at the bottom of the hill. (Neglect air resistance)

Part A - How long does it take for the projectile to reach the ground?

Part B - What is the y-component of the projectile's initial velocity?

Part C - How tall is the hill?

Part D - How far horizontally from the base of the launch-point on the hill does the projectile land?

A mass of 0.30 kg on the end of a spring oscillates with a period of 0.45 s and an amplitude of 0.15 m . A) Find the velocity when it passes the equilibrium point. B) Find the total energy of the system. C) Find the spring constant. D) Find the maximum acceleration of the mass.

a) A(n) 85-g ice cube at 0°C is placed in 920 g of water at 20°C. What is the final temperature of the mixture?

b) A 103-g cube of ice at 0°C is dropped into 1.0 kg of water that was originally at 87°C. What is the final temperature of the water after the ice has melted?

c) An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27°C. A 432-g sample of silver at an initial temperature of 89°C is placed in the water. The stirrer is used to stir the mixture gently until it reaches its final equilibrium temperature of 32°C. Calculate the mass of the aluminum cup.

Determine the position of the Fermi energy level as a function of the concentrations of dopant atoms added to the semiconductor.

A 0.55 kg basketball strikes a smooth floor at 4.0 m/s[20° below the horizontal] and rebounds at 4.0 m/s[20°above the horizontal].
a) Find the horizontal impulse acting on the ball.
b) Find the vertical impulse acting on the ball.

Newton’s 2nd Law experiment using an inclined plane Purpose This lab experiment is to verify Newton’s second law and in the process also obtain the coefficient of kinetic friction between a block and an incline. Theory Newton’s 2nd law states that the net external force on an object in a given direction is equal to the mass of the object multiplied by its acceleration, Fnet = ma, where m is the mass of the object and a is its acceleration. Applying Newton’s 2nd law to the two objects as shown in the figure below, we obtain: m1g – T = m1a (1) T – m2gSin – fk = m2a (2) where fk = kFn (3) and Fn = m2gCos (4) from (2),(3), and (4) T = m2a + m2gSin + km2gCos (5) From (5), and for  = 0, T = m2a + km2g (6) Following equation (5), a graph of T vs. a should give a straight line where the slope will be equal to m2, and the coefficient of kinetic friction may be obtained from the intercept, since the intercept will be equal to (m2gSin + km2gCos) Procedure Open the simulation at https://ophysics.com/f3.html a. Choose a constant value for mass m2. b. Choose a value for  c. Choose a coefficient of friction low enough for the masses to move, and keep this coefficient constant. Verifying the acceleration d. Choose a value for m1 e. Using the “run” and “pause” buttons, run and pause make a table of at least seven data sets of h (take the absolute value) and time. f. Make a graph of h vs. time, and an appropriate curve fit to obtain the acceleration from your graph. (Hint: x = vit + ½ at2) g. Compare the acceleration from your graph with that provided by the simulation. Verifying Newton’s 2nd Law h. Vary m1, and record the corresponding acceleration, a, and tension, T, for several (at least seven) values of m1. i. Create a table for T vs. a j. Make a graph of T vs. a k. Choose an appropriate curve fit to obtain m2 and k from your graph (Hint: Equation 5) l. Compare the m2 and k from your graph to the actual m2 and k m. Repeat steps g to k using  = 0 (Hint: equation 6) n. Compare the two k values obtained from j and k. (do a percent difference) Questions 1. If a constant nonzero force is applied to an object, what can you say about the velocity and acceleration of the object? 2. Why can we neglect forces such as those holding a body together when we apply Newton’s second law of motion? Sources: 1. CCSU Physics Lab Manual 2. Ophysics.com 3. OpenStax College Physics

a. mention and explain the characteristics of the laser beam that distinguishes it from general light
b. write a summary of the working principles of the laser according to the assignment about the laser you have made