Do the resistors on the Ohm’s law board actually have the values claimed by the manufacturer, as indicated by the color code?

2. The average distance between two neighboring stars in our galaxy is about 5 light-years. (a)

How many years would it take the Voyager 1 Space Probe to travel 5 light-years?

(b) If an alien civilization built a spaceship that can travel 5 light-years in 1000 years. How many kilometers does this spaceship travel in 1 second? (hint: Google “how far is 1 light-year”)
3. (a) How many minutes would it take the alien spaceship in question 2 to go from Earth to the moon?

(b) How many minutes would it take Voyager 1 to travel the same distance? (hint: Google “average distance between Earth and Moon”)

A brass rod with a length of 1.23 m and a cross-sectional area of 1.53 cm2 is fastened end to end to a nickel rod with length Land cross-sectional area 1.29 cm2 . The compound rod is subjected to equal and opposite pulls of magnitude 3.57×10⁴ Nat its ends.

a- Find the length L of the nickel rod if the elongations of the two rods are equal. (in m)

b- What is the stress in the brass rod? (in Pa)

c- What is the stress in the nickel rod? (in Pa)

d- What is the strain in the brass rod?

e- What is the strain in the nickel rod?

1.) A conducting loop is sitting in a magnetic field. Which of the following actions would cause the magnetic flux through the loop to change? Select all that apply.

a) change the strength of the magnetic field

b) rotate the loop

c) change the material from which the loop is made

d) change the area defined by the loop

2.) Which of the following statements are false? Select all that apply.

a) An induced magnetic field must point in the same direction as the applied magnetic field.

b) An induced magnetic field must point in the opposite direction of the applied magnetic field.

c) An induced current exists in a loop if there is a constant magnetic flux through that loop.

7. A particle of rest energy 800 MeV decays in its rest frame into two identical particles of rest energy 250 MeV. What are the kinetic energies (in MeV), momenta (in MeV/c), and velocities (in units of c) of the daughter particles?

A light spring of force constant 4.45 N/m is compressed by 8.00 cm and held between a 0.250 kg block on the left and a 0.450 kg block on the right. Both blocks are at rest on a horizontal surface. The blocks are released simultaneously so that the spring tends to push them apart. Find the maximum velocity each block attains if the coefficient of kinetic friction between each block and the surface is the following. In each case, assume that the coefficient of static friction is greater than the coefficient of kinetic friction. Let the positive direction point to the right.

A cube of edge length ℓ = 2.0 cm is positioned as shown in the figure below. There is a uniform magnetic field throughout the region with components Bx = +7.0 T, By = +2.0 T, and Bz = +1.0 T.

(a) Calculate the flux through the shaded face of the cube. [Answer] T · m²

(b) What is the net flux emerging from the volume enclosed by the cube (i.e., the net flux through all six faces)? [Answer] T · m²

Steam at 100°C is added to ice at 0°C.

(a) Find the amount of ice melted and the final temperature when the mass of steam is 12 g and the mass of ice is 45 g. Answers in g and °C

(b) Repeat with steam of mass 1.9 g and ice of mass 45 g. Answers in g and °C

The drawing shows an equilateral triangle, each side of which has a length of 3.99 cm. Point charges are fixed to each corner, as shown. The 4.00 C charge experiences a net force due to the charges qA and qB. This net force points vertically downward and has a magnitude of 305 N. Determine (a) charge qA, (b) charge qB.

Public Radio station KXPR-FM in Sacramento broadcasts at 88.9 MHz. The radio waves pass between two tall skyscrapers that are 15.0 m apart along their closest walls.

1) At what horizontal angles, relative to the original direction of the waves, will a distant antenna not receive any signal from this station?

2) If the maximum intensity is 4.00 W/m2 at the antenna, what is the intensity at ±4.00∘ from the center of the central maximum at the distant antenna?

I= W/m^2

1. Fireflies emit light across the visible spectrum, but the peak intensity of their emission is around a wavelength of 550 nm. So let’s make the approximation that all of the light emitted by a firefly has a wavelength of 550 nm. (a) A typical flash of light from a firefly lasts for about 100 ms and has a power of 1.2 mW. How many photons are emitted in each flash. (b) An “electron volt” (eV) is a unit of energy. It is the energy that an electron gains when it “falls through” a potential difference of 1.0 V. What is an electron volt, in Joules. (c) Energy is stored in a firefly’s body (just like in your body) in ATP molecules. The amount of energy provided by metabolizing one ATP molecule is 0.30 eV. How many ATP molecules does the firefly need to metabolize to emit one photon

1.) A fast moving vehicle travelling at a speed of 33.9 m/s comes up behind another vehicle which is travelling at a slower, constant speed of 15.4 m/s. If the faster vehicle does not begin braking until it is 15.8 meters away from the car in front of it, what is the minimum acceleration that the faster car must exhibit if it is to avoid colliding with the car in front? Assume that both cars are travelling in the positive direction. 2.)A college student stands on a balcony of a sorority house a distance of 10.0 meters above the ground. Her sorority sister is on the ground below the balcony, and tosses her keys straight upward toward her friend who catches the keys 4.9 seconds later. With what speed were the keys initially thrown?

Consider a tug of war between two teams. Why is it impossible for either team to pull harder on the rope than the other? If pulling on the rope harder than the opponent is impossible, why is it possible for a team to still win?

On a frictionless horizontal air table, puck A (with mass 0.251 kg ) is moving toward puck B (with mass 0.374 kg ), which is initially at rest. After the collision, puck A has velocity 0.116 m/s to the left, and puck B has velocity 0.652 m/s to the right.

Calculate ΔK, the change in the total kinetic energy of the system that occurs during the collision.