3 years ago

Why does water stay in a straw if you put your finger over it?

1 answer:

3 0

What's going on is that the water in the straw is pushed into the straw by the air pressure outside of the straw. As long as the pressure outside is able to overcome the force of gravity, the liquid will stay in the straw.

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A small ball of charge Q and mass m has a velocity v at infinity. It collides head-on with a ball of the same charge and mass wh

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Answer:

Explanation:

Kinetic energy of ball in motion = 1/2 m v² . Potential energy = 0

Let the minimum distance between the balls be d on collision.

Electric potential energy at that time= k Q²/d , Here kinetic energy is converted into potential energy . So

1/2 m v² = kQ²/d

d =2 k Q² / mv²,= 18 x 10⁹ x Q²/ m v².

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3 years ago

Suppose two waves collide and the temporary combined wave that results is smaller than the original waves. What term best descri

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The correct answer is B

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Tiger woods hits 45.0-gram golf ball, giving it a speed of 75.0 m/sec. What momentum has tiger woods given to the golf ball

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M = 45.0 g in Kg 0.045 Kg

speed = 75.0 m/sec

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hope this helps!

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3 years ago

Which type of force could be used to pull up on a metal paper clip without

solmaris [256]

Answer:

Magnetic force

Explanation:

Because a paper clip is type of a metal and magnets and paper clip get pulled to each other.

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3 years ago

The current in the wires of a circuit is 60.0 milliAmps. If the voltage impressed across the ends of the circuit were doubled (w

Pavel [41]

Answer:

120 mA

Explanation:

The relationship between voltage, current and resistance in a circuit is given by Ohm's law

$I=\frac{V}{R}$

where

I is the current

V is the voltage

R is the resistance

In this problem, we have an initial current of

I = 60 mA

Then the voltage is doubled:

V' = 2 V

while the resistance is kept the same:

R' = R

So the new current is

$I' = \frac{V'}{R'}=\frac{2V}{R}=2\frac{V}{R}=2 I$

so, the current has doubled. Since I = 60 mA, the new current is

$I' = 2(60 mA)=120 mA$

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3 years ago