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Physics

Yasmin Nguyen

Two slits in an opaque barrier each have a width of 0.020 mm and are separated by 0.050 mm. When coherent monochromatic light passes through the slits the number of interference maxima within the central diffraction maximum: Group of answer choices is 1 is 4 is 2 is 5 cannot be determined unless the wavelength is given

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Physics

Cannon Hayden

How much work is done if a 50. ON force is applied on an object in the direction of

motion while the object slides 3.00 m across the floor?

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Physics

George

A transverse wave on a rope is given by y (x, t) = (0.750cm) cos (π[ (0.400cm-1) x + (250s-1) t]). find the period

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Physics

Vinny

Which best describes why a physical change differs from a chemical change?

A.

A physical change predicts the behavior of a substance when in a reaction, whereas a chemical change is used to identify characteristics of a substance.

B.

A physical change results in a new substance being formed, and a chemical change results in a different state of matter.

C.

A physical change happens spontaneously, and a chemical change is used by scientists to create new substances.

D.

A physical change will result in a different state of matter, whereas a chemical change results in a new substance being formed.

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Physics

Corinne

You are watching children play a game of tug-o-war with an old plastic clothesline. The two teams are pulling at opposite ends of the cord and each team is trying to drag the other team into a mud puddle that lies between them. After a few minutes without progress, the team on the right suddenly pulls hard toward the right. The team on the left has anticipated this threat and is able to keep their end of the rope from moving at all. The right end of the rope stretches toward the right and the rope breaks. It took energy to breaking the rope and that energy was provided by (A) the team on the right. (B) both teams. (C) neither team. It was instead provided by chemical potential energy in the rope itself. (D) the team on the left.

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Physics

Dean Moore

What is the rate at which electrical energy is converted to another form of energy called?

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Physics

Moises Bates

A person gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. The cart travels forward along the floor, gradually slowing as it moves. Consider the horizontal force (s) on the cart while it is moving forward and slowing. Which of the following statements is correct?

Question 36 options:

Both a forward and a backward force are acting on the cart, but the forward force is larger.

Only a forward force is acting which diminishes with time.

Both a forward and a backward force are acting on the cart, but the backward force is larger.

Only a backward force is acting, no forward force.

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Physics

Cara Huynh

A driver, traveling at 22.0 m/s, slows down her 2.00 x 103 kg car to stop for a red light. What work is done by the friction force against the wheels?

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Physics

Alia Clements

If the masses of an object increase and their distance from each other stays the same the force of gravity

decreases

increases

stays the same

increases then decreases

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Physics

Martha Riggs

What is Avogadro's number?

A. 5.002 Ã - 1020

B. 2.3 Ã - 1021

C. 6.02 Ã - 1013

D. 6.02 Ã - 1023

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Physics

Azul Lambert

Mathew, a farmer, cultivates monocultures of wheat. What negative effect will monoculture farming have on Mathew's land? A. crop productivity will decrease B. greenhouse gases will generated C. nutrients will not be recycled back into the soil D. it will cause water pollution

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Physics

Avila

Which best describes the relationship between the frequency, wavelength, and speed of a wave as the wave travels through different media

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Physics

Scarlet

A novelty golf ball of mass m is launched with an initial velocity v0 = (25i + 13j) m/s and then follows a parabolic trajectory. At the top of the ball's trajectory, it explodes into two fragments A and B. Fragment A has mass mA = 1/3 m and is stationary immediately after the explosion, while Fragment B has mass mB = 2/3 m and has non-zero velocity vB immediately after splitting from Fragment A. In answering the following questions, ignore air resistance and assume the terrain over which the ball and fragments fly is level. (a) How many seconds after the launch does the ball attain its maximum height? (b) What is the velocity v of the ball immediately prior to the explosion? (c) What is the velocity of Fragment B immediately before it hits the ground?

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Physics

Sage

How many helium-filled balloons would it take to lift a person? Assume the person has a mass of 80kg and that each helium-filled balloon is spherical with a diameter of 33 cm.?

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Physics

Jaylan Reeves

Which is an application of the principle of uniformitarianism?

A.

ordering a group of fossils from largest to smallest

B.

examining a rock to find out what minerals are in the rock

C.

studying a modern river valley to learn about how ancient rock layers formed

D.

counting tree rings to determine the age of a tree

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