PHYSICS HIGH SCHOOL

A person throws a tennis ball 6 m/s straight up. How long does it take for it to come back to their hand?

Answers

Answer 1
Answer:

Answer

1.2245 s


Explanation

Using the Newton's law of linear motion,

v = u + gt


where v ⇒ Final velocity

            u ⇒ initial velocity,

             t ⇒ time to reach maximum height.

             g ⇒ acceleration due to gravity.

v = u + at

v = 0 m/s

g = -9.8 m/s²  (negative because the velocity is decreasing)

0 = 6 + -9.8t

9.8t = 6

t = 0.612244898 s

This is the time to reach maximum height. It will take the same time to come back to the hand.

so total time = 0.612244898 × 2

                      = 1.2245 s
Answer 2
Answer: Best Answer: BY v = u -gt=>0 = 6 - 9.8 x t=>t = 0.61 secThus time it take to come back to hand (T) = 2t = 1.22 secLol I hope this helps because I had funning helping you XD

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What effect does adding more loops to the wire coil have on the electromagnet?

Answers

The strength of the electromagnet depends on the magnitude of the current in the wire and the number of turns of wire around the core.  If you add more turns to the coil and keep the magnitude of the current constant, the electromagnet becomes stronger.

A suitcase had a width of 55 cm. Which unit conversion fraction should you use to find the width in inches?A. 1 cm/2.54 in

B. 1 in/2.54 cm

C. 2.54 cm/1 in

D. 1 in/1 cm

Answers

The answer is B.

When you multiply 55 cm by 1in/2.54 cm, the unit cm cancels leaving only in.

55 cm is thus 21.654 in.


Answer:

B. (1 in)/(2.54 cm)

Explanation:

A gas has an initial volume of 2.5 L at a temperature of 275 K and a pressure of 2.1 atm. The pressure of the gas increases to 2.7 atm, and the temperature of the gas increases to 298 K.The final volume of the gas, rounded to the nearest tenth, is.

Answers

The following information are given:
V1 = 2.5L
T1 = 275K
P1 = 2.1 atm
T2 = 298K
P2 = 2.7 atm
V2 = ?
The formular for solving the equation is: P1V1T1 = P2V2T2
V2 = P1V1T1/P2VT2
V2 = 2.5 * 275 * 2.7 * 298 = 1443.75/804.6 = 1.794
Therefore, V2 = 1.8L.

Its 2.1, I just took the test, the verified answer is wrong.

Is energy conserved when a ball falls to the ground

Answers

Of course. You've certainly heard that energy is conserved, period. Why would you think it's different when a ball falls to the ground ? ?

You step off of a ledge and land 0.5 seconds later. How high was the ledge?

Answers

1.25m

hope this is what you needed
1.25m

hope this is what u needed

A series circuit contains two devices, one with a resistance of 10 ohms and one with a resistance of 4 ohms. If the generator supplies a voltage of 42 V, what is the magnitude of the current? A. 2 A B. 3 A C. 1.75 A D. 1.33 A

Answers

First you calculate the total resistance. Since the resistors are connected in series, the total equivalent resistance is:
Rtotal = R1 + R2 = 10 + 4 = 14 ohms

Now you calculate the electrical current with Ohm's law:
I = U/Rtotal = 42/14 = 3A

Correct answer: B. 3 A
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