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Varvara68 [4.7K]

3 years ago

15

You hold glider A of mass 0.125 kg and glider B of mass 0.375 kg at rest on an air track with a compressed spring of negligible

mass between them. When you release the gliders, the spring pushes them apart. Once the gliders are no longer in contact with the spring, glider A is moving to the right at 0.600 m/s. What is the velocity (magnitude and direction) of glider B at this time?

1 answer:

umka2103 [35]3 years ago

8 0

Answer:

0.2 m/s

Explanation:

$m_A$ = Mass of glider A= 0.125 kg

$m_B$ = Mass of glider B = 0.375 kg

$u_A$ = Initial Velocity of glider A = 0 m/s

$u_B$ = Initial Velocity of glider B = 0 m/s

$v_A$ = Final Velocity of glider A = 0.6 m/s

$v_B$ = Final Velocity of glider B

As linear momentum is conserved

$m_{A}u_{A}+m_{B}u_{B}=m_{A}v_{A}+m_{B}v_{B}\\\Rightarrow v_B=\frac{m_{A}u_{A}+m_{B}u_{B}-m_{A}v_{A}}{m_{B}}\\\Rightarrow v_b=\frac{0+0-0.125\times 0.6}{0.375}\\\Rightarrow v_b=-0.2\ m/s$

Magnitude of the glider B at this time is 0.2 m/s

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2 years ago

Two 84.5 g ice cubes are dropped into 30 g of water in a glass. If the water is initially at a temperature of 50 C and if the ic

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Answer:

final temperature will be 0 degree C

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$m_{ice} = 182 g$

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$m_{water} = 17 g$

Explanation:

After thermal equilibrium is achieved we can say that

Heat given by water = heat absorbed by ice cubes

so we will have

Heat given by water to reach 0 degree C

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$Q_2 = 10647 J$

so we will have

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so here we can say that few amount of water will freeze here to balance the heat

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4 0

3 years ago

How high was a brick dropped from if if falls in 2.5 seconds?

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Using the kinematic equation d = V_0 * t + 1/2 * a * t^2, where d is height you can rewrite this to be d = 1/2*g*t^2 or 4.9t^2
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3 years ago

The membrane that surrounds a certain type of living cell has a surface area of 5.3 x 10-9 m2 and a thickness of 1.1 x 10-8 m. A

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$2.1\times 10^{-12} c$

Explanation:

We are given that

Surface area of membrane= $5.3\times 10^{-9} m^2$

Thickness of membrane= $1.1\times 10^{-8} m$

Assume that membrane behave like a parallel plate capacitor.

Dielectric constant=5.9

Potential difference between surfaces=85.9 mV

We have to find the charge resides on the outer surface of membrane.

Capacitance between parallel plate capacitor is given by

$C=\frac{k\epsilon_0 A}{d}$

Substitute the values then we get

Capacitance between parallel plate capacitor= $\frac{5.9\times 8.85\times 10^{-12}\times 5.3\times 10^{-9}}{1.1\times 10^{-8}}$

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3 years ago

Read 2 more answers

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Answer:

If the system consists of the block only, the work done by the gravity is negative.

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On the other hand, if the system consists of the block and the earth, then only exists a external force which is the exerted by the hand. So, the force exerted by gravity is zero.

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3 years ago