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3 years ago

7

A convex mirror has a focal length of -10.8 cm. An object is placed 32.7 cm from the mirror's surface. Determine the image dista

nce.

1 answer:

KonstantinChe [14]3 years ago

4 0

Answer:

-353.16

Explanation:

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What causes an object to slow down or speed up?

Arisa [49]

Answer:

Unbalanced forces

Explanation:

Unbalanced forces acting on an object can change the object's speed, causing it to speed up or slow down.

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3 years ago

Read 2 more answers

a 2.0 kg ball is dropped from a height of 20 m onto a soft surface and rebounds to a height of 5.0 m . what is the magnitude of

Yuki888 [10]

Based on the data provided, the impulse of the floor on the ball is 59.4 Ns.

<h3>What is the impulse of the floor on the ball?</h3>

Using the equation of motion to determine the velocity at the end of the fall

v^2 = u^2 + 2gh

Where v is velocity at the end of fall

u is initial velocity = 0

g is acceleration due to gravity = 9.81 m/s^2

h is height = 20

Taking downward velocity as negative and up as positive

v^2 = 0 + 2 (9.81)(20)

v^2 = 392.4

v = - 19.8 m/s

The velocity, v after bouncing is calculated also:

u = 0

g = 9.81 m/s^2

h = 5.0 m

v^2 = 0 + 2(9.81)(5)

v^2 = 98.1

v = 9.904 m/s

Impulse = change in momentum
Impulse = m(v- u)

Impulse = 2.0 × (9.9 -(-19.8)

Impulse = 59.4 Ns

Therefore, the impulse of the floor on the ball is 59.4 Ns.

Learn more about impulse at: brainly.com/question/904448

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2 years ago

Doubling the voltage in a circuit doubles the current if what is held constant?

antiseptic1488 [7]

The Resistance needs to be the same to allow the current to double with the voltage.

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3 years ago

When the car is moving the unbalanced force acting on the car is 150 N.

dsp73

Answer:

F = m a, a = 0.3 m / s²

this acceleration points in the direction of the unbalanced force

Explanation:

In this problem we must use Newton's second law. Let's fix a reference system with the x axis parallel to the surface and the y axis perpendicular

Y axis y

N-W = 0

N = W = mg

X axis

∑ F = m a

F = m a

we substitute

150 = m a

To find an acceleration value, the mass of the car must be known, if the mass is m = 500 kg

a = 150/500

a = 0.3 m / s²

this acceleration points in the direction of the unbalanced force

8 0

2 years ago

Thinking Mathematically: Explore the quantitative dependencies of the acceleration upon the speed and the radius of curvature. T

solong [7]

The expression for the centripetal acceleration allows to find the results for the questions are:

A) The acceleration varies INVERSELY with the radius of curvature.

B) The acceleration varies DIRECTLY with the speed.

C) The acceleration becomes four times greater.

D) The acceleration becomes nine times greater.

E) The acceleration is reduced to half.

F) The acceleration is reduced to a third.

In circular motion there must be an acceleration towards the center of the circle, it is called cenripetal acceleration, in this case all the energy supplied to the system is used to change the direction of the speed even when its magnitude remains constant.

$a_c = \frac{v^2}{r}$

Where $a_c$ the centripetal acceleration, v is the speed and r the radius of curvature of the circle.

Now we can answer the questions about centripetal acceleration.

A) For the same speed, the acceleration varies INVERSELY with the radius of curvature.

B) For the same radius of curvature the acceleration varies DIRECTLY with the speed.

C) The speed is doubled

v = 2 v₀

$a_c = \frac{(2v_o)^2 }{r}$

$a_c = 4 \ \frac{v_o^2 }{r}$

The acceleration becomes four times greater than the original value

D) The speed is tripled

v = 3 v₀

$a_c = 9 \frac{ v_o^2}{r}$

Acceleration becomes nine times greater than the original

E) the radius of curvature is doubled

r = 2 r₀

$a_c = \frac{v_o^2}{2 r_o }$

$a_c = \frac{1}{2} a_o$

Acceleration is reduced to half the original value

F) The radius of curvature is tripled

r = 3 r₀

$a_c = \frac{v_o^2 }{3 r_o} \\ \\a_c = \frac{1}{3} a_o$

The acceleration is reduced to a third of the initial one.

In conclusion using the expression for the centripetal acceleration we can find the answers for the questions are:

A) The acceleration varies INVERSELY with the radius of curvature.

B) The acceleration varies DIRECTLY with the speed.

C) The acceleration becomes four times greater.

D) The acceleration becomes nine times greater.

E) The acceleration is reduced to half.

F) The acceleration is reduced to a third.

Learn more here: brainly.com/question/6082363

6 0

3 years ago