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3 years ago

9

Two objects of the same radius start from rest and roll without slipping down a ramp. The objects are a hollow cylinder and a so

lid cylinder. Which one of them reaches the bottom of the ramp first?

1 answer:

Westkost [7]3 years ago

8 0

Answer:

Solid cylinder

Explanation:

because hollow may blow and just bounce

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27. Calculate the impulse when an average<br> force of 10 N acts on a cart for 5.0 s.

wlad13 [49]

Answer:

50 Ns

Explanation:

Impulse = force × time

J = F Δt

J = (10 N) (5.0 s)

J = 50 Ns

6 0

4 years ago

If there are 0.5 amps of current running through a circuit using a 9-volt battery, what is the resistance of the circuit?

DIA [1.3K]

Answer:

18

Explanation:

<em>V = voltage </em>

<em>I = current </em>

<em>R = resistance</em>

V = IR is the equation to find out the Voltage of an item so if we move around the equation so we are trying to resistance it would become R = V/I.

V = IR

R = V/I

R = 9/0.5

<u>R = </u><em><u>18</u></em>

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3 years ago

Find the ratio of the diameter of aluminium to copper wire, if they have the same

kicyunya [14]

Answer:

1.24

Explanation:

The resistivity of copper $\rho_1=2.65\times 10^{-8}\ \Omega-m$

The resistivity of Aluminum, $\rho_2=1.72\times 10^{-8}\ \Omega-m$

The wires have same resistance per unit length.

The resistance of a wire is given by :

$R=\rho \dfrac{l}{A}\\\\R=\rho \dfrac{l}{\pi (\dfrac{d}{2})^2}\\\\\dfrac{R}{l}=\rho \dfrac{1}{\pi (\dfrac{d}{2})^2}$

According to given condition,

$\rho_1 \dfrac{1}{\pi (\dfrac{d_1}{2})^2}=\rho_2 \dfrac{1}{\pi (\dfrac{d_2}{2})^2}\\\\\rho_1 \dfrac{1}{{d_1}^2}=\rho_2 \dfrac{1}{{d_2}^2}\\\\(\dfrac{d_2}{d_1})^2=\dfrac{\rho_1}{\rho_2}\\\\\dfrac{d_2}{d_1}=\sqrt{\dfrac{\rho_1}{\rho_2}}\\\\\dfrac{d_2}{d_1}=\sqrt{\dfrac{2.65\times 10^{-8}}{1.72\times 10^{-8}}}\\\\=1.24$

So, the required ratio of the diameter of Aluminum to Copper wire is 1.24.

3 0

3 years ago

Assume you have an ice cube and also a small rock that is the same size and shape as the ice cube. Predict what would happen if

Step2247 [10]

Answer: The ice cube would float on top of the water and the rock would sink to the bottom.

Explanation: The ice cube has a smaller density than the rock which allows the ice cube to float but makes the rock sink to the bottom of the glass of water.

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3 years ago

Think about the way your body works when you eat an ice cream cone. Provide an explanation of how organs are working together as

AlexFokin [52]

Answer:

Explanation:

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3 years ago