1- A magnet created when there is a current through a coil of wire is considered

a. electromagnet.
b. a solenoid.
c. polarized.
d. all of the above

2- The radii of the paths that ions follow in a mass spectrometer can be used to calculate the charge on the ion.
a. True
b. False

3- The __________ difference between two points separated by a distance d in a uniform field is represented by the equation ΔV = Ed.

a. electrical
b. potential
c. equipotential
d. volt

(I think its option B)

4- Electricity sent over power lines needs

a. low voltage and high current.
b. low voltage and low current.
c. high voltage and high current.
d. high voltage and low current.

5-Three resistors, 20 Ω, 40 Ω, and 40 Ω, are connected in parallel across a 12.0 V battery. What is the equivalent resistance of the this circuit diagram?

a. 10 Ω
b. 20 Ω
c. 30 Ω
d. 40 Ω

6-Transformers can change __________ with fairly little waste of energy.

a. magnetic fields
b. power
c. resistances
d. voltages

7-The _________ is proportional to the strength of the magnetic field.

a. magnetic flux per unit area
b. amount of space taken up by the magnet
c. mass of the magnet
d. size of the magnet

In the given circuit an inductor of L = 8.95-mH and a resistor of R = 17.9-Ω resistor are connected in series with a dc battery of E = 8.80-V.

What is the voltage across the resistor immediately after the switch is closed?

What is the voltage across the resistor after the switch has been closed for a long time?

What is the current in the inductor after the switch has been closed for a long time?

A simple pendulum is constructed from a negligible mass that does not stretch and a bob of mass 0.87kg that is essentially a point mass. The length of the string is 1.43m. The pendulum is started by being released from rest with an angle(with respect to the vertical) of 6.98 degrees. Use g=9.81

what is the maximum speed in m/s

the answer is 0.32m/s. how do I get this?

2. A simple pendulum is constructed from a negligible mass that does not stretch and a bob of mass 0.99kg that is essentially a point mass. The length of the string is 0.98m. The pendulum is started by being released from rest with an angle(with respect to the vertical) of 3.24 degrees. Use g=9.81

what is the maximum amplitude in degrees

the answer is 0.18. How do I get this?

What are the advantages for "professional astronomers" of the Cassegrain design over the Newtonian design?

1. A flywheel is initially rotating at 30 rad/s and has a constant angular acceleration. After 8.0 s it has rotated through 460 rad. Its angular acceleration in rad/s is:

2.Ten seconds after an electric fan is turned on, the fan rotates at 6000 rev/min. Its average angular acceleration in rad/s² is:

3.The rotational inertia of a disk about its axis is 0.70 kgˑm². When a 2.0-kg weight is added to its rim, 0.50 m from the axis, the rotational inertia in kgˑm² becomes:

4.A disk with a rotational inertia of 5.0 kgˑm² and a radius of 0.25 m rotates on a frictionless fixed axis perpendicular to the disk and through its center. A force of 8.0 N is applied along
the rim. The angular acceleration of the disk in rad/s² is:

5.A disk has a rotational inertia of 6.0 kgˑm² and a constant angular acceleration of 2.0 rad/s². If it starts from rest the work (in J) done during the first 6.0 s by the net torque acting on it is:

capacite 1: 7.3x10^-3 charge unit transfer
capacite 2: 0. 1 C/v

That means equating the two capacitances gives the conversion factor for converting between these two different units of capacitance. Follow this course to determine the number of Coulombs in one chargetransfer-unit. Show your work.




Now calculate how many fundamental units of charge transfer each time you add charges to the capacitor. Show your work.



If we assume it is electrons being transferred, does this number represent the number of electrons being transferred to the capacitor or removed from the capacitor? Explain.

I need help with these questions. please and thank you

Write an extended paragraph of about 200 words on the future of space travel that describes:

• New technology in space travel
• Future space missions
• Countries / organizations that are involved in space missions.

The explanation:
When writing this question it is very important to explain the new technology that the scientists developed and how it will be used to benefit the astronauts in their missions. After that, you should mention some of the future space missions. Then, you need to list the name of the countries and organizations that are involved in the space missions.

PLEASE ANSWER THE QUESTIONS WITH EXPLANATION.

1 mm bug located at the near-point, 25 cm away from the left eye. Includes the distance between the retina and lens in your eye is 1 cm.

What focal length for your eye lens is needed to focus the bugs' image onto your retina?

If you insert a convex magnifying glass of 6 cm away from the bug, between the bug and your eye, How far away from the glass lens will the virtual image of the bug be located if the focal length of that glass lens is 7 cm?

2. G’s jokes are represented by 1 mole of a solid at temperature T₁ < 273K. They are so savage that when you put them in an ocean of mass M,

initially at temperature T₂ > 273 K, 2 / 3 of that ocean freezes (and the jokes remain solid). You may assume both c_m of liquid ocean and

∆ H_m of melting ocean at T_melt = 273 K are known.

a) What is the molar specific heat of G’s jokes?

b) What is the change in the entropy of the universe as a result of G’s jokes interacting with

the ocean?

c) Challenge mode (do this last). Is your answer in b) consistent with the second law of

thermodynamics? Prove why or why not.

The study of our solar system and the universe has expanded greatly since we started sending probes into space. In an informed discussion (provide references), explain the value of space exploration with regard to our understanding of physics.

For CdS in the wurtzite structure the lattice constants are specified by a= 4.14 A and c= 1.62 a. Calculate the density of the crystal and the volume of the primitive unit cell. What is the number of nearest neighbors and the distance between them? How many atoms does the primitive unit cell contain?

1. A 1 kilogram mass is attached to a spring with a spring constant of 4 N/m. Write the equation of motion if the spring is stretched 25 cm below the equilibrium position and released.

a) Suppose the system experiences a constant forcing function downwards of 4 N. (Note that one would need to divide by the mass, but the mass is 1 kg so we don’t see a difference here.) Solve the non-homogeneous equation. (Keep everything else about the initial value problem the same.) How does the forcing function change the solution/motion?

b) Suppose the forcing function is the periodic function ?(?) = 4 cos ?. Solve that nonhomogeneous equation. What is the period and amplitude of the motion in this system?

c) Suppose the forcing function is the periodic function ?(?) = 4 cos 2?. Solve this nonhomogeneous equation. How does the period and amplitude of the motion change? How would you describe the motion?

1) Jumper cables used to start a stalled vehicle oen carry a 70-A current. How strong is the magnetic field 5.0 cm from one cable? Compare to the Earth’s magnetic field (5.0 × 10−5 T).

2) A power line carries a current of 100 A west along the tops of 10-m-high poles. (a) What is the magnitude and direction of the magnetic field produced by this wire at the ground directly below? How does this compare with the Earth’s magnetic eld of about 1 2 G? (b) Where would the wire’s magnetic field cancel the Earth’s field?

For something like Gamma Ray Spectroscopy, what do taking photo peak measurements give us? What does the Count vs Channel plot tell us?

The mass m₁ on a smooth table is connected to the mass m₂ which moves only in the vertical direction by an inextensible L length rope passing through a hole in the table. Answer the following by ignoring the friction in the system.
a) What are the generalized coordinates of the system. Write the Lagrangian of the system using these coordinates.
b) Find the conservative values of the system.
c) Obtain the Lagrange equations of the system and discuss what these equations mean.
d) Solve the Lagrange equations. Assume that the masses do not pass through the hole.