Physics Answers

 A spelunker is surveying a cave. He follows a passage that goes 210m straight West, then 180m in a direction 350 East of North, then 110m at 800 South of East. After a fourth unmeasured displacement, he finds himself back where he started. Determine the fourth displacement (magnitude and direction).

Activity Direction: Place a raisin or marshmallow on the end of a stick of spaghetti. Shake your hands back and forth to make the pasta/raisin system oscillate.

Materials: Pasta and Raisins/Marshmallows

A. Does the period depend on the mass?

B. Does the period depend on the length?

Answer the following questions on a separate paper.

• a) Do you think this system motion would fall under the classification of simple harmonic motion? Provide as much evidences as you can for your answer.

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• b) Do your answers to A and B above matches a spring/mass system or a pendulum? How so?

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• c) Do you think this system can be modeled as pendulum, spring, or neither? What are your reasons for each?

1.      The lenses of the eyeglasses are being cleaned using a nylon cloth. In doing so, which becomes positively charged? Negatively charged? Assume that the lenses are made of glass.

Q3.A boy of mass 50 kg climbs 12steps each of height 20 cm in 50 seconds. Calculate the power used by the boy in climbing the stairs.

Charge q1 = 7.00 μC is at the origin, and charge q2 = -5.00 μC is on the x-axis, 0.300 m from the origin as shown below. (a) Find the magnitude and direction of the electric field at point P, which has coordinates (0, 0.400) m. (b) Find the force on a charge of 2.00 × 10-8 C placed at P

1. How do you explain the operation of a simple electric motor?

2. How do you explain the operation of generator?

3. What are the similarities and differences between electric motor and generator?

4. How do you imagine the kind of life if motors and generators were not discovered?

Direction: Solve the following problems stated below. Show your solutions.

1. Compute the electric flux of the following sets of variables:

a. E = 7.2x10^-5. N/C

A = 1.6x10^-6 m^2

θ = 30°

b. E = 9.7x10^5 N/C

A = 5.3x10^-6 m^2

θ = 75°

c. E = 6.5x10^5 N/C

A = 8.3x10^-6 m^2

θ = 30°

Direction: Solve the following problems below. Show your solutions.

a. A charge of 3x10^-8 C experiences an electrostatic force of 6.0x10^-8 N. Compute the force per coulomb that the charge experiences.

b. Compute the electric field experienced by a negative test charge given the following conditions in a vacuum.

i. Source charge: -4.33x10^-12 C

ii. Distance from source charge: 2.33x10^-5 m

If the initial angular speed of the fan blades is 3.0 rad / sec, what is the final angular speed of the fan blades in rad/sec? 

b) Do the following fields satisfy all four Maxwell's equations? E(t)=E_(0)sin x sin t , B(t)=B_(0)cos x cos t