A wedge is simply a form of an inclined plane. TRUE or FALSE.

Answers

Answer 1

Answer:

The statement about "A wedge is simply a form of an inclined plane" is false. The pivot joint is the lever and the wedge are the blades of the scissors. This is to efficiently exert force on an object to cut it.

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An object has a mass of 0.25 kg what is the gravitational force of on the object by the earth?
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What happens to the force between the objects if Mass 2 decreases? (increases, decreasesaffected)

Answers

The more separation two objects have, the more the force between them decreases. When mass 1 increases the force between the objects increases. If Mass 2 decreases, the force between the objects decreases.

Material speed of lightspace 3 x 108 m/s
water 2.25 x 108 m/s
glass 2 x 108 m/s
air 3 x 108 m/s

Light moves from air into a new material. The greatest refraction would occur when light passes through which material?
A) air
B) glass
C) water
D) It would refract the same amount in each material.

Answers

The question is poor. Light doesn't refract on its way THROUGH anything. It refracts at the boundary BETWEEN two different media. The effect is greatest where the ratio of the speeds of light in the two media is greatest. On your list, that would be at the boundary between air or space and glass.

Answer: I think the answer is B glass.

Explanation: Because Glass is light.

The quantum mechanical model of the atom ____. a. defines the exact path of an electron around the nucleus b. was proposed by Niels Bohr c. involves finding an electron somewhere in a specific orbital d. has many analogies in the visible world

Answers

Answer:

Quantum mechanical model = involves finding an electron somewhere in a specific orbital.

Explanation:

The quantum mechanical model of an atom involves finding an electron somewhere in a specific orbital. This method is completely based on mathematical calculations. It defines the probability of finding an electron rather than its reality.

These are designated by some letters like s, p, d, f...... and the corresponding energy levels are 1st, 2nd, 3rd and so on.....

So, the correct option is (c) "involves finding an electron somewhere in a specific orbital".

c. involves finding an electron somewhere in a specific orbital

Which two objects have stored energy? A) a ball rolling on the ground
B) a small rock sitting on top of a big rock
C) a stretched rubber band
D) a stone lying on the ground

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a ball rolling on the ground

A baseball of mass 250g, pitched with a speed of 40m/s is caught by the catcher, whose glove moves backward 0.25m while stopping the ball. What was the kinetic energy of the ball before it was caught?

Answers

I don't think we care about the motion of the catcher's glove.

The mass of the ball is 0.25kg and its speed is 40m/s.
So its kinetic energy is . . .

KE = 1/2 (mass) (speed)² =

(0.125 kg) (40m/s)² =

200 kg-m²/s² = 200 joules .

The kinetic energy is =.5mv^2 so the amount the glove moved beforehand is irrelevant and typically this is measured in Kgm/s so 250g is .25kg and v^2 is 40x40 so 1600 lastly 1600x.5x.25 is 200kgm/s :)

A 68 kg runner exerts a force of 59N. What is the acceleration of the runner?

Answers

Explanation:

Newton's First Law ,

F = ma

a = m/F

a = 68 / 59

a = 1.15 m/s2

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Calculate (A⃗ ×B⃗ )⋅C⃗ for the three vectors A⃗ with magnitude A = 4.86 and angle θA = 23.5 ∘ measured in the sense from the +x - axis toward the +y - axis, B⃗ with B = 4.02 and θB = 60.1 ∘, and C⃗ with magnitude C = 6.02 and in the +z - direction. Vectors A⃗ and B⃗ are in the xy-plane.