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3 years ago

A ball is thrown straight up. What will

Physics

2 answers:

Papessa [141]3 years ago

6 0

Answer:

velocity at the top: 0 m/s

acceleration at the top: -9.8 m/s²

Explanation:

Assuming up is positive and down is negative;

The velocity of the ball at the top of its path will be 0 m/s and the acceleration will be negative.

The velocity is 0 m/s because the ball does not move at the top of its path, and it switches from a positive velocity to a negative velocity. It must go through 0 in order to go from positive to negative.

The acceleration, however, is always negative no matter where the ball is in its motion. This negative acceleration causes the ball to slow down as it reaches the top, and speed up as it reaches the bottom.

Think about it: If there wasn't a negative acceleration, and it was instead 0, the ball would never come back down and instead keep going in a straight line.

MissGirl3 years ago

0 0

eventually it will come back down?
i mean what goes up must come down!
xD

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Vascular resistance is the friction force that opposes blood flow in a blood vessel. what two factors are the most important in

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The two most important factors are Systematic Vascular Resistance as and Vascular Resistance.

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4 years ago

A light beam is traveling through an unknown substance. When it exits that substance and enters into air, the angle of reflectio

bogdanovich [222]

Answer:

0.79

Explanation:

Using Snell's law, we have that:

n(1) * sin θ1 = n(2) * sinθ2

Where n(1) = refractive index of air = 1.0003

θ1 = angle of incidence

n(2) = refractive index of second substance

θ2 = angle of refraction

The angle of reflection through the unknown substance is the same as the angle of incidence of air. This means that θ1 = 32°

=> 1.0003 * sin32 = n(2) * sin42

n(2) = (1.0003 * sin32) / sin42

n(2) = 0.79

3 0

3 years ago

Read 2 more answers

CHEGG You have two pipes, having the same elevation, connected to each other that transport water. The given density of water is

Yakvenalex [24]

Answer:

P = 0.6814 MPa

Explanation:

For this exercise we must use the Betuliano relation

P₁ + ½ ρ v₁² + ρ g y₁ = P₂ + ½ rho v₂² + rho g y₂

where we use the subscript 1 for the first pipe and the subscript 2 for the second pipe

indicate that the two pipes are at the same level therefore

y₁ = y₂

P₂ = P₁ + ½ ro (v₁² - v₂²)

let's calculate

P₂ = 13,785 10⁵ + ½ 997 (41,221² - 55,654²)

P₂ = (13.785 - 6.97) 105

P₂ = 6.814 10⁵ Pa

let's reduce to Mpa

P₂ = 6.814 10⁵ Pa (1 MPa / 10⁶ Pa)

P₂ = 6.814 10-1 MPa

P = 0.6814 MPa

3 0

3 years ago

Superman used X-ray vision to detect objects. Aside from a source of X-rays, what else would be needed for X-ray vision?

Arada [10]

Answer:

an absorber of x-ray

Explanation:

To make x-ray detection/vision work, you will need at least two items: a source of x-ray and absorbed or x-ray.

The object you want to see itself doesn't have to be the source, but it has to absorb some of the rays instead. When doing a chest x-ray test, the medical employee will put your chest between absorber and source. The heart can absorb some of the rays so it will appear more white than lungs who made of air and won't absorb the rays.

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3 years ago

A golf ball is hit with an initial velocity of 155 ft/s at an angle of 23 degrees with the horizontal. After 1.4 seconds, how fa

riadik2000 [5.3K]

2) s(t) = 155tcos(23°) 
=> s(1.4) = 155 * 1.4 * cos(23°) 
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=> v(t) = -32t + 155sin(23°) 
=> h(t) = -16t^2 + 155tsin(23°) 
=> h(1.4) = -16(1.4)^2 + 155(1.4)sin(23°) 
=> h(1.4) ≈ 53.4 ft (1 dp) <== distance displaced vertically.

6 0

3 years ago