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How to answer the questions:

Total current in the circuit = 2A

For the circuit above... Find the equivalent resistance, the total voltage and the current and voltage across each resistor.

Think of a word problem that matches this expression

2x + 4 = 14

I can’t think of a word problem

4/8x = 2/3

Give a example of a word problem that would match this expression

10x + 8 = 18

what is uncertainly principal?

What is the initial velocity of an arrow shot from a bow that has been stretched for 0.60m with an average force of 190N? The arrow has a mass of 0.050kg

2. Two positive point charges are a fixed distance apart. The sum of their charges is QT. What charge must each have in order to (a) maximize the electric force between them and (b) minimize it?

One way to make a compass is to stick a magnetized needle into a piece of cork and float it in a glass bowl full of water. The needle will align itself with the horizontal component of the Earth's magnetic field. Since the north pole of this compass is attracted northward, will the needle float toward the north side of the bowl? Defend your answer.

A certain object is not in equilibrium. Three of the following statements could possibly be true, and one must be true. Which one of the following must be true?


A) Only two perpendicular forces act on the object.


B) Only three forces act on the object.


C) Only a single force acts on the object.


D) A net force acts on the object.

What is the electric potential at the point P (located at the origin) in the diagram below if q = 3.0 µC.

�

                                     |
                                     |
+q___________________ P___________________+q
(-3m,0)                          |                                 (3m,0)
                                     |
                                     |

A horizontal wire holds a solid uniform ball of mass m in place on a tilted ramp that rises 350
above the
horizontal. The surface of this ramp is perfectly smooth, and the wire is directed away from the center of
the ball (Fig. 2). (a) Draw a free-body diagram for the ball. (b) How hard does the surface of the ramp
push on the ball? (c) What is the tension in the wire?

A cylindrical conductor of radius R = 2.70 cm carries a currentof I = 3.30 A along its length. This current is uniformlydistributed throughout the cross section of the conductor.

(a) Calculate the magnitude of the magnetic field midway along theradius of the wire (that is, at r = R/2).

Round your answer to three significant figures. Take thepermeability of free space to be 4π x 10^(-7) T*m/A.

____________ μT

(b) Find the distance beyond the surface of the conductor at whichthe magnitude of the magnetic field has the same value as themagnitude of the field at r = R/2.

____________cm

How would the position of Fermi level EF with respect to the intrinsic energy level Ei change, if instead of Boltzmann statistics, Fermi-Dirac statistics were used?

Two charges of -0.64 C each are located at opposite corners of a square having a side of 0.0225 m. 

Find the electric field strength at the center of the square. 

A 2.3 kg cart is rolling across a frictionless, horizontal tracktowards a 1.5 kg cart that is initially at rest. The carts areloaded with strong magnets that cause them to attract to eachother. Thus, the speed of each cart increases. At a certain instantbefore contact the carts collide, the first cart's velocity is +4.5m/s and the second cart's is -1.9m/s.
a) What is the momentum of the system of the two carts at thisinstant?
b) What was the velocity of the first cart when the second cart wasstill at rest?

What is the acceleration of a rising hot-air balloon if the ratio of the air density outside the balloon to that inside is 1.55? Neglect the mass of the balloon fabric and the basket.

Consider the equation E=hf, where E is the energy of light, h isPlanck's Constant and f is frequency. This means that photons of light can occur:

a. with any value for energy
b. with only even amounts of energy
c. with only energies of multiples of Planck's Constant.
d. none of the above

In a collision experiment, the ratio of the velocity change between two carts of equal inertia is found to equal 1. What happens to this ratio if the experiment is repeated in the following conditions? (a) The inertia of each cart is doubled, and the same initial velocities are used. (b) The original value of inertia is used, and the initial velocities of the carts are doubled.

A TV set is pushed a distance of 2m with a force of 20N that is is in the same direction as the set moves. How much work is done on the set?

6. Do time dilation and length contraction occur at normal speeds (~100 mph)? Explain.

Light of intensity 0.50 W/m2 passes through the pupil of one of your eyes and eventually falls on your retina. The radius of the pupil is controlled by the iris. In a human eye, the radius of the pupil can vary from about 1.0 mm to about 3.5 mm. The area of the opening can be calculated from pi (3.1416) times the radius squared. If your pupil is open to a radius of 3 mm, how much light energy passes through in one minute? Give your answer in millijoules.

2)An 800-g iron block is heated to 390 degrees C and placed in aninsulated container (of negligible heat capacity) containing 35.0 gof water at 25.0 degrees C. What is the equilibrium temperature ofthis system? The average specific heat of iron over thistemperature range is 560 J/(kg*K) .
____=degrees C

Name the two main gases in the atmosphere , & state their relative percentages 

Decreasing the separation between isolated oppositely charged parallel plates will 

A. increase the electric potential between the plates
B. increase the energy stored on the plates
C. decrease the charge on the plates
D. increase the charge on the plates
E. decrease the electric potential between the plates

A hammer has a claw resistance length of 2 in the nail it is pulling has a resistance force of 800 lb. the handle of the hammer is 10 in long. How much effort force has to be applied to pull the nail?

11. A laser beam is incident at an angle of 30.0° to the verti-
cal onto a solution of corn syrup in water. If the beam 
is refracted to 19.24° to the vertical, (a) what is the 
index of refraction of the syrup solution? Suppose 
the light is red, with wavelength 632.8 nm in a vacuum. 
Find its (b) wavelength, (c) frequency, and (d) speed in 
the solution.
 

What happens to the total relativistic energy of a speedy protonwhen its relativistic mass doubles?
(a) It doubles.
(b) It more than doubles.
(c) It less than doubles.
(d) It must increase, but it is impossible to say how much.

can you find a vector quantity that has a magnitude of zero but components that are different from zero ?explain

an object is 10 of cm from a concave mirror with a focal length of 7.00cm. the object is 5.00 cm tall. draw a ray diagram of this situation

five resistors are connected to a battery

A 65.0 kg person throws a 0.0420 kg snowball forward with a ground speed of 28.0 m/s. A second person, with a mass of 57.0 kg, catches the snowball. Both people are on skates. The first person initially moving forward with a speed of 2.00 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregard the friction between the skates and the ice. thrower m/s
catcher m/s

A truck is accelerating as it speeds down the highway. One inertial frame of reference is attatched to the ground with its origin at a fence post. A second frame of reference is attatched to a police car that is traveling down the highway at a constant velocity. Is the momentum of the truck the same in these two reference frames? Explain. Is the rate of change of the truck's momentum the same in these two frames? Explain.

A vector A has magnitude 12.0 m and vector B has magnitude 16.0 m. The scalar product A.B is 112 m2. What is the magnitude of the vector product between these vectors?

A small block is released from rest at the top of a frictionless incline. The block travels a distance 0.383 m in the first second after it is released. How far does it travel in the next second?

An empty parallel plate capacitor is connected to a battery that maintains a constant potential difference between the plates. With the battery connected, a dielectric is then inserted between the plates. Do the following quantities decrease, remain the same, or increase when the dielectric is inserted? (a) The electric field between the plates (b) The capacitance.

A charged particle is held at the center of two concentric conducting spherical shells. Figure (a) shows a cross section. Figure (b) gives the net flux Φ through a Gaussian sphere centered on the particle, as a function of the radius r of the sphere. The scale of the vertical axis is set by Φ_s = 3.0 × 10⁵ N·m²/C. What are (a) the charge of the central particle and the net charges of (b) shell A and (c) shell B?