Astronomers have discovered a new planet around a nearby Sun-like star. The following data on the planet is known. It has a density of 1.4 relative to water along with a mass of 7.8×1027 kg and a radius of 77,000 km, and its orbital period is 0.52 years.

a) From this information determine the following: the mass and radius of the planet relative to Earth, semi-major axis of the planet’s orbit, as well as the mass of the host star. (Note: To find the relative value of any quantity take a ratio of the new value to the comparison value, for example in this case the comparison values are Earth’s)

b) From the information given and derived in part a), determine what type of planet this new discovery is and in which part of its solar system it lives.

c) Given what we discussed in class about planetary atmospheres, predict what kind of atmosphere this planet will have.

You (mass 81 kg) and your friend (mass unknown) are in a rowboat (mass 65 kg) on a calm lake. You are at the center of the boat rowing and she is at the back, 2 m from the center. You get tired and stop rowing. She offers to row and after the boat comes to rest, you change places. You notice that after changing places the boat has moved 20 cm relative to a fixed log. What is your friend's mass? (Note that there are two possible solutions. Provide both.)

A block of mass M = 4.0kg is released from rest at point A as shown. Part AB of the track is frictionless and is one quarter of a circle of radius R=1.25m. The horizontal part of the track BC is rough with co-efficient of kinetic friction . The block comes to rest at C after moving a distance L = 6.25m. The block can be treated as a point particle.

[a] What is the speed (in m/s) of M at B?

A block of mass M = 4.0kg is released from rest at point A as shown. Part AB of the track is frictionless and is one quarter of a circle of radius R=1.25m. The horizontal part of the track BC is rough with co-efficient of kinetic friction . The block comes to rest at C after moving a distance L = 6.25m. The block can be treated as a point particle.

[b] What is the value of μ_k?

Two colors of light, green and yellow, undergoes diffraction through the same diffraction grating. Which color of light sees greater diffraction angle?

Light is emitted when a valence electron moves from a lower state to an excited state.

True

False

Light produced from spontaneous emission is incoherent.

True

False

----Modern Physics question: Please be thorough with your explanation.

Using the Internet, find the location of a particle accelerator. In several paragraphs describe its size, what particles are being accelerated, how they are being accelerated, what their target is, how the particles are detected and what sub-atomic particles have been discovered at the site. Be sure to cite your sources.

physics 211:

a block is placed on an adjustable ramp and then the tilt of the ramp is increased slowly until the block begins to slide. why exactly does the block refuse to slide at some angles, but once the tilt is large enough it always slides down the ramp?

Venus is known for its very high surface temperatures, caused by a huge greenhouse gas effect. However, atmospheric density, surface temperature and surface pressure are also very different from Earth’s due to a different atmospheric composition AND much greater depth. The pressure at the surface is 92 x Earth’s (it is 101,000 Pa on Earth), due to the presence of a dense atmosphere with a depth of 20 km to the top of its troposphere (ignoring the impact of very thin gases above the troposphere, just like on Earth). The surface temperature averages 460o C. The mix of gases in the Venusian atmosphere is 96.5% CO2, 3.5% N2. R, Universal gas constant = 8.314 Jmol-1 K-1 . Based on the above information and knowing how to find the atmosphere’s density, calculate g, the acceleration due to gravity on Venus (note: this is NOT a time to use Newton’s laws of gravity!).

1. Briefly describe three different sound processing schemes used to modify received sound signals before they are sent to a cochlear implant.

Please just list the three and a small description of each, thanks!

A small object with mass m, charge q, and initial speed v0 = 6.00×10³ m/s is projected into a uniform electric field between two parallel metal plates of length 26.0 cm (Figure 1). The electric field between the plates is directed downward and has magnitude E = 700 N/C . Assume that the field is zero outside the region between the plates. The separation between the plates is large enough for the object to pass between the plates without hitting the lower plate. After passing through the field region, the object is deflected downward a vertical distance d = 1.35 cm from its original direction of motion and reaches a collecting plate that is 56.0 cm from the edge of the parallel plates. Ignore gravity and air resistance.

Calculate the object's charge-to-mass ratio, q/m.

~Unit C/kg

The magnetic force acting on a moving electric charge is found to be independent of the sign of the charge.

True

False

We place the N magnetic pole of a magnet near the N magnetic pole of a second magnet. We find:

It was discovered that Electric Currents are the source of magnetic fields.

True

False

The Earth N and S magnetic poles are not stable. They are constantly moving in geologic time scales.

True

False

The Galvanometer is an instrument used to detect electric currents that takes advantage of the magnetic effects of currents.

True

False

In an AC to DC rectifier circuit, the output DC signal of the rectified wave was measured to be
V_DC= (6.6±0.6)V and its ripple voltage was measured to be V_ripple=(0.27±0.02) mV. What is the uncertainty on the quality factor of the rectifier?

For any multimedia applications, describe how Quality of Service (QoS) guarantees for available bandwidth, delay, jitter and loss rate with DiffServ and IntServ? Highlight the issues with suitable diagrams.

Ice cubes usually float in a glass of water. If you push the ice cubes down to the bottom of the glass (using a straw), would they cool the water more, or less, quickly? Explain.

A rubber bullet is shot with a speed of 130 meters per second with an angle 67.4 degrees above the horizontal. The ground is 115 meters above from where the rubber bullet was shot.

1. How much time is the bullet in flight?

2. How much time will it take for the bullet to reach max height?

3. How much is the max altitude the bullet can reach>

4. What time is the bullet 425 meters from the ground?

5. What is the range of the bullet?

6. What is the final velocity when the bullet hits the ground?

Compute the average of x and x^2 and determine ∆x for the ground state of the harmonic oscillator. b) Determine the average potential energy and describe how it is related to the total energy?