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rosijanka [135]

3 years ago

10

When an inclined plane is used, A. the mechanical advantage increases as the height increases. B. a smaller force is exerted ove

r a longer distance. C. a negative mechanical advantage can result. D. a greater force is exerted over a shorter distance

1 answer:

lesantik [10]3 years ago

7 0

Choice-B says it all.

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If an object moves in uniform circular motion in a circle of radius R = 1.00 meter, and the object takes 4.00 seconds to complet

Korolek [52]

Answer:

D. 247 m/s2

Explanation:

The centripetal acceleration is given by:

$a=\omega^2 r$

where

$\omega$ is the angular speed

r = 1.00 m is the radius of the circular trajectory

The object takes 4.00 seconds to complete 10 revolutions. 1 revolution corresponds to an angle of $2 \pi rad$ , so 10 revolutions correspond to an angle of $10 \cdot 2 \pi = 20 \pi rad$ . The angular speed is therefore

$\omega = \frac{\Delta \theta}{\Delta t}=\frac{20 \pi}{4.0 s}=15.7 rad/s$

And so, the centripetal acceleration is

$a=\omega^2 r = (15.7 rad/s)^2 (1.0 m)=246.5 m/s^2 \sim 247 m/s^2$

6 0

3 years ago

Read 2 more answers

How do evaporation and condensation relate to heat

igomit [66]

Both of them are phase changes that result from the flow of heat. Evaporation happens when heat is added to a substance. Condensation happens when heat comes out of a substance.

8 0

4 years ago

Three faces of a cube of side length 2 cm each have a uniform electric field of magnitude 500 N/C pointing directly inward. The

Maurinko [17]

Answer:

$Q=-8.85*10^{-12}*0.36 C =-3.186*10^{-12} C$

(negative charge)

Explanation:

Hi!

To solve this problem we use Gauss Law for electric fields, which relates the flux of electric field E through a closed surface S with the charge Q enclosed by that surface:

$\int_{S} \vec{E}\cdot \vec{n} \;dA = \frac{Q}{\epsilon_0}$

$\vec{n} = \text{outwards surface normal}\\\epsilon_0 = 8.85*10^{-12}\frac{C^2}{Nm^2}$

In this problem S is a cube of side length 2cm. The integral is easy because the electric field is uniform in each face, and normal to the face. The total integral is the sum of the integrals in each of the six faces.

$\int_{S} \vec{E}\cdot \vec{n} \;dA = \frac{Q}{\epsilon_0} = 3(-500\frac{N}{C} (2cm)^2) + 3(200\frac{N}{C} (2cm)^2)$

$(-1500*4*10^{-4}\frac{Nm^2}{C} + 600*4*10^{-4}\frac{Nm^2}{C} )=-0.36\frac{Nm^2}{C}$

$Q=-8.85*10^{-12}*0.36 C =-3.186*10^{-12} C$

3 0

3 years ago

Identical net forces act for the same length of time on two different spherical masses. Which of the following describes the cha

Novosadov [1.4K]

Answer:

the correct answer is c

Explanation:

In this exercise we seek the momentum

I = F t

this value is set because forces and time are given.

Now we can use the relationship between linear momentum and momentum

I = p_f - p₀

I = m v_f - m v₀

suppose that the two spheres depart with the same initial velocity

Let's analyze these results, the value of the impulse is the same, so the body of lower mass must acquire greater speed or momentum

consequently the lighter sphere acquires more final speed, but the change of momentum is the same in the two spheres

Consequently the correct answer is c

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3 years ago

The definition of solid

ddd [48]

A solid is a firm shaped with packed components

Ex.

- Ice

- Wood

- Brick

- Crayon ( not yet melted)

8 0

4 years ago