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3 years ago

Jumping up is work against gravity why

Physics

1 answer:

lions [1.4K]3 years ago

6 0

Answer:

gravitational force attract us towards the ground

Explanation:

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Light rays from an object after passing through a convex lens form an image at the focal point behind the lens (opposite side of

Colt1911 [192]

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

The actual position of the object is between the focal point and twice the focal length and <span>at the focal point in front of the lens. I think it would be A and C. </span>

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3 years ago

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A tuning fork vibrates 240 times per second. What is the frequency and period?

OverLord2011 [107]

Answer:

Frequency is expressed in Hertz, which is simply cycles per second. If a tuning fork (or anything else, for that matter) vibrates 1 time each second, it's frequency is 1 Hz. So then, if it vibrates 4280 in 20 seconds, then 4280÷20=214 cycles per second = 214 Hz.

Explanation:

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3 years ago

Particle A and particle B are held together with a compressed spring between them. When they are released, the spring pushes the

Alinara [238K]

Answer:

Kinetic energy of mass A = 20 J

Kinetic energy of mass B = 40 J

Explanation:

Lets take final speed of mass A = v

The final speed of mass B = v'

mass of A= m

mass of B = m'

m = 2 m'

There is no any external force so the linear momentum will be conserve.

Pi = pf

0 = m v + m ' v'

0 = 2 m ' v +m ' v'

v ' = - 2 v

Now from energy conservation

1/2 k x²=1/2 m v² + 1/2 m' v'²

60 = 1/2 m v² + 1/2 m' v'²

m v² + m' v'² = 120

2 m ' (-v'/2)² + m' v'² = 120

m ' v'²/2 + m' v'² = 120

m' v '² = 80

m =2 m' and v ' = - 2 v

m/2 ( 4 v²) = 80

m v ²=40

So the kinetic energy of mass A= 1/2 m v² = 20 J

Kinetic energy of mass B = 1/2 m' v'² = 40 J

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3 years ago

Part AIf the potential of plate 1 is V, then, in equilibrium, what are the potentials of plates 3 and 6? Assume that the negativ

Nana76 [90]

Answer:

Part a: The potential at point 3 and point 6 are V and 0 respectively.

Part b: The charges Q1, Q2 and Q3 are CV, 2CV and 3CV respectively.

Part c: The net charge is 6CV.

Part d: The equivalent capacitance is 6C

Explanation:

As the question is not given here ,the complete question is found online and is attached herewith.

Part a:

V1 = V, V3 = V1 = V

and, V6 = V1-V = 0

The potential at point 3 and point 6 are V and 0 respectively

Part b

Q1 =CV = Q,

Q2 = 2C *V = 2Q

Q3 = 3 C*V = 3Q

So the charges Q1, Q2 and Q3 are CV, 2CV and 3CV respectively.

Part c

Total charge of the system,

Q_net =Q1+Q2+Q3= (1+2+3) CV = 6 CV

So the net charge is 6CV.

Part d:

Equivalent Capacitance = Net charge / Voltage

Eq. C = 6CV/V = 6C

So the equivalent capacitance is 6C

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3 years ago

What is the acceleration of a ball traveling horizontally with an initial velocity of 20 meters/second and, 2.0 seconds later, a

skad [1K]

The answer would be a=5 m/s^2
I hope this helps you, have a great day!

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3 years ago

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Jumping up is work against gravity why​

Jumping up is work against gravity why