Prelab 7: DC Circuits 1

What are the units of Resistance?

Watch the video tutorial about series and parallel circuits. Explain what ammeters and voltmeters do – Why are they hooked up to the circuit differently, and why don't they affect the circuit?

What is the resistance of a resistor when the colored bands read yellow, red, green and gold ?

What is a thermistor?

Three resistors with values of 1,488 Ohms, 1,101 Ohms and 860 Ohms are in parallel with each other in a circuit. What is the equivalent resistance of this parallel circuit?

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An automobile of mass 1500kg moving at 25m/s collides with a truck of mass 4500kg at rest. This time, the car and the truck bounce off each other completely elastically. What is the final velocity of the truck after the collision? Call the direction of the automobile before the collision positive.

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An automobile of mass 1500kg moving at 25m/s collides with a truck of mass 4500kg at rest. This time, the car and the truck bounce off each other completely elastically. What is the final velocity of the car after the collision? Call the initial direction of the automobile positive.

A block slides down a frictionless inclined ramp. If the ramp angle is 26° and its length is 29 m, find the speed of the block as it reaches the bottom of the ramp, assuming it started sliding from rest at the top.

A thin, rectangular sheet of metal has mass M and sides of length a and b. Find the moment of inertia of this sheet about an axis that lies in the plane of the plate, passes through the center of the plate, and is parallel to the side with length b. Express your answer in terms of some or all of the variables M, a, and b

Find the moment of inertia of the plate for an axis that lies in the plane of the plate, passes through the center of the plate, and is perpendicular to the axis in part A.

Express your answer in terms of some or all of the variables M, a, and b.

If matter has a wave nature, why is this wave-like characteristic not observable in our daily experiences?

Any object of macroscopic size—including a grain of dust—has an undetectably small wavelength, so any diffraction effects it might exhibit are very small, effectively undetectable. Recall historically how the diffraction of sound waves was at one time well known, but the diffraction of light was not.

Only objects of macroscopic size, like an ocean wave, actually exhibit a wave nature. Smaller, microscopic objects—including a grain of dust—do not exhibit a wave nature.    

Only objects of microscopic size, like an atom, actually exhibit a wave nature. Larger, macroscopic objects—including a grain of dust—do not exhibit a wave nature.

Any object of macroscopic size—including a grain of dust—has a large wavelength, so any diffraction effects it might exhibit are very large, too large to be detectable. Recall historically how the diffraction of sound waves was at one time well known, but the diffraction of light was not.

Part 1. A certain helix in three-dimensional space is described by the equations x = cos theta, y = sin theta, and z = theta. Calculate the line integral, along one loop of this helix, of the dot product V

An LED that emits light of wavelength λ = 614 nm illuminates the phototube. A reverse bias is applied to the phototube (a voltage that opposes the current flow). This is adjusted carefully until the photocurrent drops to zero. The stopping potential is found to be Vo = 0.162 V.

The LED can now be changed and the process repeated for a different λ. Then the data can be plotted to determine Planck's constant, h.

For the data collected above what value would you plot on the x-axis of your graph? (Use c = 3.00 x 108m/s.)

Express your answer in SI units to 3 significant figures.

Entering numbers in scientific notation: Example: 1.45 x 10-9 should be entered as 1.45E-9

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A wheel has an initial angular velocity of 1 rad/s and undergoes an angular acceleration of 10 rad/s^2. (a) How many radians does it rotate in 4 sec? (b) What is its angular velocity at this time?

An alpha particle with kinetic energy 12.0 MeV makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude L=p0b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.30×10⁻¹² m . (Assume that the lead nucleus remains stationary and that it may be treated as a point charge. The atomic number of lead is 82. The alpha particle is a helium nucleus, with atomic number 2.)

Part A

What is the distance of closest approach?

Part B

Repeat for b=1.50×10⁻¹³ m .

Part C

Repeat for b=1.30×10⁻¹⁴ m .

The heat capacity, Cp, of liquid carbon disulfide is a relatively constant 78J(molK). However, the heat capacity of solid carbon disulfide varies greatly with temperature. From 99K to its melting point at 161K, the heat capacity of solid carbon disulfide increases linearly from 44 J/(molK) to 57 J/(molK).

The enthalpy of fusion of carbon disulfide is 4390 J/mol.

The absolute entropy of liquid carbon disulfide at 298K is 151 K/(molK).

Estimate the absolute entropy of carbon disulfide at 99K.

a projectile is launched from ground level to the top of a cliff which is 95 m away and 155 m high. If the projectile lands on top of the cliff 7.6 s after it is fired, what was its initial velocity? (Be careful what you assume).

Demonstrate that the ground-state wave function for the one-dimensional harmonic oscillator satisfies the appropriate Schrodinger's equation

An arrow strikes the target at the end of a 27-meter-long lane. It lands at an angle of 4 degrees below the horizontal. What is the initial velocity at which the arrow was launched? Assume that the initial velocity toward the target is entirely horizontal and the angel of the arrow in the target is the direction of the final velocity.

3 boxes, having masses m1=5kg, m2=10kg and m3=15 kg are stacked "sideways" (i.e., in x-) on a surface with coefficient of kinetic friction 0.7 mu_k; an external force of magnitude 15 N pushes on the right-most box, making an angle of 30 degrees relative to the horizontal; a second force of magnitude 20 N pushes in the opposite direction on the left-most box, as a result of which all three accelerate uniformly. Determine the numerical value all of the forces acting on each of the boxes (including all normal forces between the boxes), as well as the amount the boxes have moved after a time of 7 seconds. Keep in mind that the normal force acting specifically on the box subject to the external force is changed by the external force...

please make a diagram