You stand 17.5 m from a wall holding a tennis ball. You throw the tennis ball at the wall at an angle of 38.5 ∘ from the ground with an initial speed of 21.5 m / s. At what height above its initial position does the tennis ball hit the wall? Ignore any effects of air resistance.  

4/ You are operating a fan with the characteristics shown in the figure below. The 25 kW fan currently operates continuously at full speed with the flow reduced to 90% of its rated capacity using downstream dampers. An evaluation reveals that there is inadequate fresh air being introduced into the building during the day, and too much is supplied at night. The flow rate needs to increase to 100% from 7am to 7pm, and can be reduced to 50% at night. What would be the CHANGE in energy costn per year if this change was done using either downstream dampers, or using a 97% efficient VSD ?

• ηmot = 0.96 at the nominal speed

• ηmot = 0.94 at 90% of the nominal speed

• ηmot = 0.89 at 50% of the nominal speed

• Electricity costs $0.15/kWh, no impact on demand charges

A diverging lens (f = -20cm) is placed 10cm to the left of a plane mirror. A match stick is placed 25cm to the left of the lens. (I) Where is the final image of the stick? (II) Is the image real or virtual? Upright or inverted? (III) What is the magnification? (IV) Where is the final image relative to the mirror?

A 0.046-nm x-ray is incident on a stationary electron. A scattered photon is observed at 94°.

Find the energy of the scattered photon E'_γ= ______ keV and its wavelength λ'= _________ nm

Find the kinetic energy of recoiled electron

K= _______keV

Find the speed of recoiled electron as a fraction of speed of light: v/c= ________

Explain the importance of having understanding of the physics or chemistry
of failure mechanisms when one is doing accelerated life testing.

1. What is the difference between Q and q? Under what assumptions is investment solely a function of q? what is the difference between the capita Q and small q in investment function

(2) Please show that a discontinuity arises in the first derivative of the wave function of the infinite potential well (0 to L).

Using plane waves, find the Fresnel and Snell formulas. (Reflection and refraction). Show that in a vacuum plane waves propagate orthogonally to each other, and are transverse to the direction of propagation

Introduce hydraulic loss   into the Bernoulli equation to account for the energy lost by the water flowing through the small horizontal pipe. Derive the expression for the hydraulic loss by considering two points at the inlet and outlet of the small horizontal pipe.

A bicycle racer sprints at the end of a race to clinch a victory. The racer has an initial velocity of 13.0 m/s and accelerates at the rate of 0.600 m/s² for 7.00 s.

(a) What is his final velocity?
(b) The racer continues at this velocity to the finish line. If he was 300 m from the finish line when he started to accelerate, how much time did he save?
(c) One other racer was 5.00 m ahead when the winner started to accelerate, but he was unable to accelerate and traveled at 13.3 m/s until the finish line. How far ahead of him (in meters and in seconds) did the winner finish?

distance

time

Can a free particle be normalised? Explain your answer?

I need proper answers for the following ( well explained and understandable writing)

1. A long, vertical, metallic wire carries downward electric current. (i) What is the direction of the magnetic field it creates at a point 2 cm horizontally east of the center of the wire? Why?

(a) north

(b) south

(c) east

(d) west

(e) up

2. One pole of a magnet attracts a nail. Will the other pole of the magnet attract the nail? Explain. Also explain how a magnet sticks to a refrigerator door.

I need proper answers for the following ( well explained and understandable writing)

1) A hollow copper tube carries a current along its length. Why is B =0 inside the tube? Is B nonzero outside the tube?

2)  Why does hitting a magnet with a hammer cause the magnetism to be reduced

Enter the letters corresponding to all the true statements.

1. At a certain location there is a constant horizontal magnetic field pointing to the east. A square loop of wire is placed in this field. At time A the bottom of the loop is resting on the floor (which is insulating), and the plane of the square loop is vertical and perpendicular to the magnetic field. The loop tips over and at time B it is flat on the floor. For this situation...

A) The induced current is greatest just before the loop starts to tip
     B) While the loop is tipping over, the induced current is flowing northward through the bottom side of the square
     C) The magnetic flux does not change as a result of the loop tipping over
     D) Current is induced to flow in the loop because the magnetic flux is changing
     E) Before the loop starts to tip over, there is no induced current in the square loop

2. Electromagnetic waves are traveling straight down towards the center of the earth. For these waves...

     A) if the electric field points east, the associated magnetic field points north
     B) if the electric field points north, the associated magnetic field points east
     C) a high-frequency wave has a shorter wavelength than a low-frequency wave
     D) green light has a higher frequency than blue light
     E) visible light has a longer wavelength than ultraviolet light

A 150-g baseball is dropped from a tree 13.0 mabove the ground.

A) With what speed would it hit the ground if air resistance could be ignored?

B) If it actually hits the ground with a speed of 9.00 m/s , what is the magnitude of the average force of air resistance exerted on it?