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Physics

Alanna Nicholson

Materials having resistance changes as voltage or current varies are called:

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Physics

Turtle

Which can you do to reduce the power consumption in your home?

A Add more circuit breakers.

B Wire more parallel circuits.

C Replace 75-watt light bulbs with 40-watt light bulbs.

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Physics

Cortez Daugherty

How could you identify the unmarked poles of a magnet?

A. Observe the concentration of field lines.

B. Put a magnet with known poles nearby.

C. Sprinkle iron fillings nearby and observe the field lines.

D. Put an iron nail nearby, with its head facing one pole.

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Physics

Serena Osborn

According to the equation for the Balmer line spectrum of hydrogen, a value of n = 3 gives a red spectral line at 656.3 nm, a value of n = 4 gives a green line at 486.1 nm, and a value of n = 5 gives a blue line at 434.0 nm. Calculate the energy in kilojoules per mole of the radiation corresponding to each of these spectral lines. McMurry, John E ... Chemistry (p. 189). Pearson Education. Kindle Edition.

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Physics

Rudy Mcdonald

Technician A says that gaskets are used to fill a space or gap between two objects to prevent leakage from occurring. Technician B says that there are many types of gaskets including cylinder head gaskets, valve cover gaskets, and timing cover gaskets. Which technician is correct?

A. Technician A only

B. Technician B only

C. Both technicians

D. Neither A nor B.

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Physics

Loosetooth

The density of ocean water increases when it

a. joins the Gulf Stream.

c. gets warmer.

b. gets colder.

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Physics

Rylee Haney

a) For a given material, would you expect the surface energy to be greater than, the same as, or less than the grain boundary energy? Choose the answer for part (a) from the menu in accordance to the question statement (b) Is the grain boundary energy of a small-angle grain boundary less than for a high-angle one? (yes or no)

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Physics

Bronson Alexander

Determine the stopping distances for a car with an initial speed of 95 km/h and human reaction time of 1.0 s for the following accelerations.

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Physics

Ella Gilmore

Work is being done in which of these situations? All motions are at a constant velocity (including velocity = zero).

A.

Jessica pushes a 25 kilogram cart a distance of 10 meters.

B.

Bane carries a 20 kilogram box a distance of 50 meters.

C.

A weightlifter holds a 100 kilogram barbell over his head.

D.

Ali is trying to push a truck away from the parking lot.

E.

Yana carries a 5 kilogram bag a distance of 1 kilometer.

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Physics

Dillon Mcdonald

If you increase the size of the resistor and keep the voltage the same, what will happen to the current

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Physics

Madison Salas

The bending of waves due to a change in speed is called

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Physics

Morgan Gibbs

An astronaut drops a feather from 1.2m above the surface of the moon. If the acceleration of gravity on the moon is 1.6 m/s, how long does it take the feather to hit the moon's surface

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Physics

Kiara Bryant

Which best explains the relationship between the speed of sound and the medium through which it passes?

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Physics

Krish

Find the magnitude of the torque produced by a 4.5 N force applied to a door at a perpendicular distance of 0.26 m from the hinge. Answer in units of N · m.

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Physics

Macy Hobbs

A box of weight w=2.0N accelerates down a rough plane that is inclined at an angle ϕ=30∘ above the horizontal, as shown (Figure 6). The normal force acting on the box has a magnitude n=1.7N, the coefficient of kinetic friction between the box and the plane is μk=0.30, and the displacement d⃗ of the box is 1.8 m down the inclined plane. What is the work Ww done on the box by the weight of the box?

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