A string of total mass 3.00×10^-2kg is stretched to a length of 4.9m by applying a tension of 14.20N. You flick the end of the string, sending a pulse to the far end. It reflects back to your hand.

PLEASE SHOW WORK, I REALLY WANT TO KNOW HOW TO DO THIS!

A) How fast is the pulse moving?

B) How much time does it take for the pulse to make the round trip (from your hand to the other end and back again)?

1. What are the factors in determining your takeoff critical field length for a certain runway? If after doing initial calculations you find the runway is too short, what might you be able to do as the pilot in command to be legal for takeoff?

A home run is hit in such a way that the baseball just clears a wall 21.0 m high, located 130 m from home plate. The ball is hit at an angle of 35.0° to the horizontal, and air resistance is negligible. Find initial speed of the ball. (Assume the ball is hit at a height of 1.00 m above the ground.)Find the speed of the ball when it reaches the wall.

How is GEOMETRIC OPTICS relevant to the development of autonomous or semi-autonomous technology and include? How is Magnetic field relevant to the development of autonomous or semi-autonomous technology and include?

It was shown in Example 21.11 (Section 21.5) in the textbook that the electric field due to an infinite line of charge is perpendicular to the line and has magnitude E=λ/2πϵ0r. Consider an imaginary cylinder with a radius of r = 0.105 m and a length of l = 0.410 m that has an infinite line of positive charge running along its axis. The charge per unit length on the line is λlambda = 5.65 μC/m .

What is the electric flux through the cylinder due to this infinite line of charge?

What is the flux through the cylinder if its radius is increased to r=0.565 m ?

What is the flux through the cylinder if its length is increased to l=0.785 m ?

Do regions where there is high electric potential also mean there is a high electric field?

1.

X-rays are scattered from electrons in a carbon target. The measured wavelength shift is 0.00131 nm. Calculate the scattering angle. The speed of light is 3 × 108 m/s and Planck’s constant is 6.626 × 10?34 J · s. Answer in units of ? .

2.

A 0.0011 nm photon scatters from a free electron. For what (photon) scattering angle will the recoiling electron and scattered photon have the same kinetic energy? The speed of light is 3 × 108 m/s and Planck’s constant is 6.626 × 10?34 J · s. Answer in units of ? .

please help

ANSWERS MUST BE CORRECT: (Detailed explanation of order of processes required. Take your time and answer it perfectly to receive credit. The most detailed answer and explanation will be awarded points).

A series RC circuit with C = 30 uF and R = 5.4 ohm has a 18 V source in it. With the capacitor initially uncharged, an open switch in the circuit is closed.

QUESTION:

What is the current in the resistor at that time?    (Express your answer using two significant figures).

                             I = ???   A  

A rectangular piece of cardboard with an L-shaped hole is held 1.0m directly in front of a point source of light. The cardboard is 1.5m away from a wall. The cardboard and the wall are parallel. The height H of the L is 15.40cm. The width W of the L is 7.08cm.

How tall is the image of the L on the wall?
How wide is the image of the L on the wall?

A small mailbag is released from a helicopter that is descending steadily at 2.77 m/s.

(a) After 4.00 s, what is the speed of the mailbag?

(b) How far is it below the helicopter?

(c) What are your answers to parts (a) and (b) if the helicopter is rising steadily at 2.77 m/s?

2. A 2kg puck is located at position (5???? 2???)m with velocity (?7???? ???)m/s at time t=0s. I apply a
constant force of magnitude 10N in the direction (?4???+ 2???) for 10 seconds. At time t=10s, the
puck is at position (????+ 10???)m with a velocity of 5m/s in the direction (???+ ???).
a. How much work did I do on the puck?
b. How much work is done on the puck total?
c. What is the average power input to the puck from all sources?

Imagine an isolated, 10-liter cylinder containing one mole of ideal gas held in the left five liters of the cylinder by a piston, initially locked in place. The right half of the cylinder is evacuated; the entire system is maintained at constant temperature. When the piston is freed to move frictionlessly, we could track the motion of the piston and the volume in 1-liter increments. Calculate the change in entropy (in J mol^-1 K^-1) of the gas upon expansion after each of the five 1-liter increments. Demonstrate that the total entropy is indeed maximized when the expansion is complete. Make a table.

In this problem, you will apply kinematic equations to a jumping flea. Take the magnitude of free-fall acceleration to be 9.80 m/s2 . Ignore air resistance.

A flea jumps straight up to a maximum height of 0.450 m . What is its initial velocity v0 as it leaves the ground?

How long is the flea in the air from the time it jumps to the time it hits the ground?

In a physics laboratory experiment, a coil with 250 turns enclosing an area of 11.8cm2 is rotated in a time interval of 3.00

Face west and set the time for February 1, 2012 at 9 p.m. Observe the position of Venus at the beginning of each month through June 1, 2012. Explain where you would expect to find Venus from June1, 2012 through July 1, 2012. Why would you not be able to see the planet during June?
(Check your answer by facing east and by setting the time for 5:30 a.m.)