The figure shows an approximate plot of stress versus strain for a spider-web thread, out to the point of breaking at a strain of 2.05. The vertical axis scale is set by a = 0.130 GN/m²,b = 0.460 GN/m², and c = 0.840 GN/m². Assume that the thread has an initial length of 0.780 cm, an initial cross-sectional area of 8.00 × 10^-12 m², and (during stretching) a constant volume. The strain on the thread is the ratio of the change in the thread's length to that initial length, and the stress on the thread is the ratio of the collision force to that initial cross-sectional area. Assume also that when the single thread snares a flying insect, the insect's kinetic energy is transferred to the stretching of the thread. a) How much kinetic energy would put the thread on the verge of breaking? What is the kinetic energy of b) a fruit fly of mass 6.50 mg and speed 1.90 m/s and c) a bumble bee of mass 0.400 g and speed 0.360 m/s? Would d) the fruit fly and e) the bumble bee break the thread?

The graph shows a= 0.700, b= 1.40, c= 2.05.

When high voltage is run through hydrogen, light is emitted that is concentrated in three areas of the visible spectrum: red, cyan, and violet. How did Bohr explain this, and how did de Broglie alter that explanation to extend it to the emission spectrum of other elements?

A. A disk of radius 0.15 m spins at a rate of 18 rad/s. What is the linear speed of a point on its outer rim? How long does it take that point to make a complete revolution? What would be given as the frequency in hertz of this motion?

B. A mass and spring system is built with a spring constant of 5.0 N/m and a mass of 2 kg. What is its period of oscillation? What length would a simple pendulum have to have to make an identical mass oscillate with that same period?

3. Interference: Consider the double slit experiment conducted in lab. You now have a new double slit slide to analyze. On the wall 1.75m away from the slits, the first minima occurs 0.65 mm to the side of the central maxima when using the red laser (wavelength=633 nm).

a) Find the slit spacing.

b) If the fourth maximum (from the central maximum) is missing, what is the slit width? Be sure to justify your answer with the appropriate equation(s).

c) What is the double slit phase at the third double slit minima?

d) What is the single slit phase at the third double slit minima?

e) What is the combined intensity at the third double slit minima?

What is wave ? Differentiate between Longitudinal wave and Transverse wave. How can you generate both types of wave on a slinky? Write in detail

a) The rotational characteristic energy E_0r for the nitrogen molecule N₂ is 2.48 x 10^-4 eV. Find the bond lenght of the molecule.

b) Write the electronic configuration of this molecule.

A -3.50 nC point charge is at the origin, and a second -5.50 nC point charge is on the x-axis at x = 0.800 mm.

D) Find the net electric force that the two charges would exert on an electron placed at point on the x-axis at x = 0.200 mm. Express your answer with the appropriate units. Enter positive value if the force is in the positive x-direction and negative value if the force is in the negative x-direction.

F) Find the net electric force that the two charges would exert on an electron placed at point on the x-axis at x = -0.200 m. Express your answer with the appropriate units. Enter positive value if the force is in the positive x-direction and negative value if the force is in the negative x-direction.

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?