1. On a planet, the acceleration due to gravity is only 7.2 m/s². A person living on that planet throws a football at 10 m/s at an angle of 48 degrees to the horizontal. The person is standing, so the ball launches from an initial height of 1.8 meters above the ground. (Ignore any air resistance here.)

1. What maximum height from the ground would the ball reach?
2. What would be the flight time before the ball gets back to the ground?

Explain the method of determining the charge-to-mass ratio (e/m) in the Thomson experiment.

An interstitial in the lattice structure puts the surrounding bonds lattice in tension or compression? How does this stress affect movements of dislocations? Use figures/schematics to explains.

Explain the model of blackbody. Present and explain Wien’s and Stefan’s laws regarding the blackbody radiation. Explain Planck’s hypothesis of energy quanta.

what is the angular separation between a star at Right Ascension 6hr and Declination 60 degrees and another star at Right Ascension 0hr and Declination 60 degrees? and also please explain what is angular separation?

Derive the barometric formula which shows in an isothermal atmosphere the pressure as a function of height.

Choose the correct answer/s.

1.) In an interference experiment, monochromatic light from a laser is passed through two parallel slits separated by d.  An interference pattern is formed on the screen placed at a distance R from the screen. If the separation distance between the slits is doubled, which of the following is true?

2.)

Which of the following statements is NOT true about a double-slit interference pattern?

3.)

If you compare the single-slit pattern and the double-lit pattern, which of the following is correct?

8.)

In a diffraction experiment, monochromatic light from a laser is passed through a slit of width a.  A diffraction pattern is formed on the screen placed at a distance x from the screen. Which of the following statements is true?

an 10 kg object is hung from a spring attached to a fixed support. The spring constant of the spring is k=40 Nm**(-1) (I mean to the power of -1) Suppose an external downward force of magnitude f(T) = 20 e **(-2t) N is applied to the object, and damping due to air resistence occurs with damping constant beta = 40 N s m **(-1). Let y(t) denote the distance in meters of the object below its equilibrium position at time t seconds. Take the gravitational constant to be g=9.8 m.s**(-2). a) Draw a diagram of the system, showing all forces acting on the object, assuming object is above the equilibrium position and moving down. Include the direction and magnitude of each force.

b) state the equation of motion of object.

c) Find the general solution to the equation of motion.

d) Assume that the object initially starts at the equilibrium position with the velocity of 2 m.s**(-1) upwards

i. Find the position of the object at any time.

ii. At what times, if any, is the object located at its equilibrium position?

A massless rod of length L = 2.3 m stands up straight, fixed to the ground by a bolt. A horizontal force of 8.2 N is applied at a vertical distance of L/2 to the right. To counter this force and keep the rod stationary, a wire is fixed at the top of the rod and attached to the ground some distance away to the left, making an angle of 45 degrees to the horizontal.

a) What is the tension in the wire, in N?

Answer: 5.798

b) Calculate the horizontal component of the force of the bolt on the rod, in N, taking right as positive.

Answer: -4.1

c) Calculate the vertical component of the force of the bolt on the rod, in N, taking up as positive.

Answer: 4.1

Suppose you’re building a contraption which contains a solid rod of length L = 11.1 m and mass 4.5 kg. This rod has its lower end barely above the ground at an angle of 23.7 degrees with respect to the horizontal, and is ultimately held up by a rope connected at a distance L/4 from the top of the rod making an angle of 25.4 degrees with respect to the rod. The top of the rod may rotate as it is held in place by a bolt connected to a wall. Calculate the tension in the rope which keeps the rod from touching the ground.

Answer: 188.475

Could you please write down the full solution?

Powder specimens of three different monoatomic cubic crystals are analyzed with a Debye-Scherrer camera. It is known that one sample is fcc, one is bcc, and one has the diamond structure. The approximate positions of the first four diffraction rings in each case are: A: 42.2, 49.2, 72.2, 87.3; B: 28.8, 41.0, 50.8, 59.6; C: 42.8, 73.2, 89.0, 115.0 (a) Identify the crystal structures of A, B, and C. (b) If the wavelength of the incident x-ray beam is 1.5Å, what is the length of the side of the conventional cubic cell in each case?

There is already an answer on Chegg for this question, but it doesnt elaborate on why things were done, I don't understand how to work backwards from the angles to get the structure

Brakes are applied to a 3000-kg car moving at 30 m/s. The car skids 200 m and stops. What is the coefficient of kinetic friction?

1. A vehicle (truck A), with a mass of 1800 kg, is tested for safety at a lab by having another vehicle (truck B) crash into it from behind. Initially, Truck A is at rest and truck B approaches at about 45 km/hr. After the crash, truck B recoils back at 10 km/hr, while truck A is pushed forward at 27 km/hr. Remember to give all answers in standard units. (This collision would likely be inelastic.)

1. Draw a sketch showing the trucks before AND after the collision, with your directions properly labeled.

2. Given these results, what must have been the mass of truck B? (Assume neither car lost any mass during the collision.)

1. How much did the total energy of the system (A + B) change? Was this change a gain or a loss of energy?