If we recreated the scene from Fast & Furious 7 and dropped a Challenger SRT® Hellcat Redeye Widebody from a C-130 aircraft at 5,280 ft, how much horsepower would it take to drive past it before it hits the ground if you’re 1 mile away? Air density @ sea level, 59 degrees, no wind = p = .002377 slugs/ft^3 Coefficient of drag (flat plate, NASA) = C(d) = 1.28 Weight = W = 4451 lbs Gravitation constant = g = 32.2 ft/sec^2 Area = A = 197.5" long x 78.2" wide x (1 ft^2/ 144 in^2) Vehicle falls flat, wheels 1st, straight down, at constant acceleration with no aerodynamic drag until terminal velocity Horsepower needed to accelerate is AVERAGE - not peak 100% driveline efficiency

A solid cylinder is mounted above the ground with its axis of rotation oriented horizontally. A rope is wound around the cylinder and its free end is attached to a block of mass 75.5 kg that rests on a platform. The cylinder has a mass of 205 kg and a radius of 0.350 m. Assume that the cylinder can rotate about its axis without any friction and the rope is of negligible mass. The platform is suddenly removed from under the block. The block falls down toward the ground and as it does so, it causes the rope to unwind and the cylinder to rotate.

(A) What is the angular acceleration, in rad/s², of the cylinder?

(B)How many revolutions does the cylinder make in 5 s?

(C) How much of the rope, in meters, unwinds in this time interval?

Light in a vacuum is incident on a transparent glass slab. The angle of incidence is 37.0

(a) Describe the distinction between transverse and longitudinal waves. Give an example of each type ofwave, describing the disturbance in each case.

(b) Describe why the frequency of a wave perceived by an observer depends on her velocity.

(c) Ultrasound measurements in medicine are often conducted using wavelengths of 0.03 cm and can be used measure blood flow speeds via the Doppler effect. Given that the speed ofsound in the body is 1550 m/s, what is the maximum frequency difference between the transmitted and received signals for a blood flow velocity of 13 cm/s.

What is the appropriate interplanar spacing which is needed to detect and analyze the (a)Fe K line and (b)Ti L line?

A student is running at her top speed of 5m/s to catch a bus, which is stopped at a bus stop. When the student is still 80m behind the bus, it starts to pull away, moving with a constant acceleration of 0.1m/s2. (a) How much time will be needed for student to catch the bus? (b) What distance does the student have to run before she catches the bus? (c) When she reaches the bus, how fast is the bus traveling? (d) If the student is running too slow, she will not catch the bus. What is the minimum velocity vm with which she should run and still catch the bus? (e) At what time she would catch the bus now?

You are just starting a new job as investigator for the car collision investigation. You assist your superior in order to determine, as accurately as possible, the circumstances surrounding collisions (initial velocity of the vehicles involved, direction vehicles were heading, etc.) in order to determine whether the drivers at fault under the Criminal Code (dangerous driving causing death or other charges).

The weather is great and you arrive at the station as your boss tells you, “Hey, Daniel, hurry over to Jalan BBN 1/A. There has been an accident involving two cars. There are people injured.” You rush to the scene of the accident immediately. Your job is to take photos of the vehicles as they are positioned, and take a certain number of measurements, including the length of the skid marks and layout of the debris.

Your findings are as follows:
• Numerous debris (broken glass, plastic, etc.) were found at a distance of 12 m from the cars;
• The two cars stuck together (red car is heading to the black car) and there are skid marks over 12 m;
• There are also skid marks over a distance of 30 m before the debris;
• The posted speed limit on this street is 70 km/h;
• Other information: m1(red car) = 2500 kg, m2(black car) = 1100 kg.

Return to the station, your superior yells out, “Hey, Daniel, make yourself useful! Bring the friction block and spring scale, and take the measurements needed to calculate the pavement’s coefficient of friction.” Confused, but very eager, you take the heavy iron friction block, covered with tire treads, and the spring scale.

Your superior returns to you and says, “The two drivers aren’t saying much. The one in the black car was sent to the hospital. The driver in the red car is still discussing what happened, but nothing is clear!” Since you are always willing to help, you answer, “How can I help you, Sir?” Your superior’s face lights up when he hears your proposition, “Well, it’s that…, you see, we must be sure, beyond any doubt, that dangerous driving was involved… the judge needs evidence. We must gather all the necessary evidence. All I’m sure of is that, based on the skid marks, the black car was at the stop when the collision occurred. This a perfect job for an intern! Get to work! I want a full report as soon as possible”. Knowing that this information will decide whether the driver will be charged under Criminal Code, you take your role very seriously and immediately get to work.

Considering that the accident occurred in a 70 km/h zone, what do you suggest to your superior? How would you clearly explain to your superior about the method used to determine the speed of the driver at fault?

Learning outcomes:

Successful students will be able to:
1. Calculate the velocities of two vehicles before and after impact using physics principles, such as forces, motion, mechanical energy, and conservation of momentum.
2. Explain how frictional forces related to varying surfaces affect the motion of an object.

A beam of monochromatic green light is diffracted by a slit of width 0.500 mm. The diffraction pattern forms on a wall 2.06 m beyond the slit. The distance between the positions of zero intensity on both sides of the central bright fringe is 5.10 mm. Calculate the wavelength of the light.

Use the slope of the graph of τ vs. square root of L to calculate g and its uncertainty. δg = 2g δ (slope) Show your work

we should use m2=2buy/sqrtof y but how?!!

http://www.pa.msu.edu/courses/2015summer/PHY251/labfiles/practical2.pdf

A 11.9-kg object oscillates at the end of a vertical spring that has a spring constant of 1.80 ✕ 10⁴ N/m. The effect of air resistance is represented by the damping coefficient

b = 3.00 N · s/m.

(a) Calculate the frequency of the damped oscillation.
Hz

(b) By what percentage does the amplitude of the oscillation decrease in each cycle?
%

(c) Find the time interval that elapses while the energy of the system drops to 3.00% of its initial value.
s

Describe the working principle of a Silicon Solar Cell.

a) How the solar cell generates electricity? Describe n/p doping, depletion region concepts.

b) Describe the meaning of Fill Factor. How do you calculate the fill factor? What can be the reasons of bad fill factor behavior?

c) A solar panel has an area of 0.5 m2 and illuminated with an irradiation of 1000W/m2 . Its open circuit voltage is 24 V and Short Circuit Current is 5.5 A. If the FF of the solar panel is 78%, then calculate the efficiency of the solar panel.

A body weighing 10 pounds forces hangs from a spring with constant 4/5 lb / ft. The medium where the body moves it offers a resistance force to movement that is numerically equal to its instantaneous speed. If the weight is released 5/3 feet above your balance position with a downward speed of 6 feet per second, determine the position the lower the object reaches. Consider negative downward and positive upward magnitudes

What is the speed of the wave pulse? 

What is the tension in the slinky?

What is the average speed of a piece of the slinky as a complete wave pulse passes? 

What is the wavelength of the wave pulse? 

5)
Now the slinky is stretched to twice its length (but the total mass does not change).
What is the new tension in the slinky? (assume the slinky acts as a spring that obeys Hooke’s Law) 

6)
What is the new mass density of the slinky? 

7)
What is the new time it takes for a wave pulse to travel down the slinky? 

8)
If the new wave pulse has the same frequency, what is the new wavelength? (m)

In a 250-word post, choose one or more of the topics listed below. to write about, include an active hyperlink to your resource...

Look for an article or news story/video that relates to one or more of the following topics:

• Electric Charge
• Coulomb's Law
• Electric Field

A 0.077-nm x-ray is incident on a stationary electron. A scattered photon is observed at 102°. 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= .