PHYSICS HIGH SCHOOL

1. A player kicks a football from ground level with an initial velocity of 22m/s, 35° above the horizontal. Assume that air resistance is negligible. Find the ball’s hang time.a. Find the maximum height of the ball in question 2.

b. Find the ball’s range from question 2.

Answers

Answer 1

Answer:

Answer:

2.57 s

8.12 m

46.4 m

Explanation:

1. In the y direction:

s = 0 m

u = 22 sin 35° m/s = 12.6 m/s

a = -9.8 m/s²

Find: t

s = ut + ½ at²

0 = (12.6) t + ½ (-9.8) t²

t = 2.57 s

2. In the y direction:

u = 12.6 m/s

v = 0 m/s

a = -9.8 m/s²

Find: s

v² = u² + 2as

0² = (12.6)² + 2 (-9.8) s

s = 8.12 m

3. In the x direction:

u = 22 cos 35° m/s = 18.0 m/s

a = 0 m/s²

t = 2.57 s

Find: s

s = ut + ½ at²

s = (18.0) (2.57) + ½ (0) (2.57)²

s = 46.4 m

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A 10,000-kg railroad car travels down the track at 30 m/s and hits a second stationary railroad car of 20,000 kg. The cars become coupled and continue traveling. Calculate the final velocity of the cars.

In a given circuit, the supplied voltage is 1.5 volts. One resistor is 3 ohms and the other is 2 ohms. Use Ohm's law to determine the current in the circuit. 0.3 amps 1.5 amps 7.5 amps 3.3 amps The purpose of a fuse or circuit breaker is _____. to speed up the current to slow down the current to stop current that is flowing too fast to stop current that is flowing too slow

Answers

Part #1:
You haven't mentioned whether the resistors are in series
or in parallel. It's going to make a difference.

-- If the resistors are in series, then their net effective resistance
is their sum.

   (3 ohms) + (2 ohms) = 5 ohms.

Current in the circuit is

(supply voltage) / (total resistance)

   =    (1.5 volts) / (5 ohms) = 0.3 ampere .

-- If the resistors are in parallel, then their net effective resistance
   is
   (their product) / (their sum)

      = (1 ohms x 2 ohms) / (1 ohm + 2 ohms)

    =    (2 ohms²) / (3 ohms) = 2/3 ohm .

Current in the circuit is

(supply voltage) / (total resistance)

   = (1.5 volts) / (2/3 ohm) = 1.0 ampere .

I guess your resistors are in series, because 0.3 amp
is one of the choices but 1.0 amp isn't.
______________________________________

Part #2.
When it comes to talking about electric current, the terms
"speed up", "slow down", "fast", and "slow" are somewhere
between meaningless and absurd.

The purpose of a fuse or circuit breaker is to shut down a current
that is too great ... too great a magnitude, too many electrons all
trying to crowd their way through the wire at the same time, like
100 lines of ants all carrying bread crumbs through a straw and
back to their hole, when there was only supposed to be one or
two lines.

Speed has nothing to do with it. All electric currents flow through
wires at the same speed, at least in high school. It's a matter of
Amperes, which has nothing to do with speed.

Which of the following statements is not true regarding atmospheric pressure?

Answers

Answer:

Atmospheric pressure increases with increasing altitude

Explanation:

Atmospheric pressure decreases with increasing height (altitude).

Ideally, there are no options given here with which the question can be answered, however after searching the question on google, a similar question popped up on two websites with the same set of options. doubnut.com and weegy.com and the options are;

A. Mercury and aneroid barometers are used to measure atmospheric pressure.

B. You calculate absolute pressure by adding atmospheric pressure to gauge pressure.

C. Atmospheric pressure increases with increasing altitude.

D. When atmospheric pressure is higher than the absolute pressure of a gas in a container, a partial vacuum exists in the container

When atmospheric pressure is higher than the absolute pressure of a gas in a container.

Which statement best explains the relationship between the electric force between two charged objects and the distance between them?As the distance increases by a factor, the electric force increases by the square of that factor.

As the distance increases by a factor, the electric force increases by twice that factor.

As the distance increases by a factor, the electric force decreases by twice that factor.

As the distance increases by a factor, the electric force decreases by the same factor.

As the distance increases by a factor, the electric force decreases by the square of that factor.

Answers

According to Coulomb's Law. The relationship between the electric force between two charged objects and the distance between them is:
F = 1/d^2

So,

As the distance increases by a factor, the electric force decreases by the square of that factor.

One light-hour is the distance that light travels in an hour. How far is this, in kilometers? (Recall that the speed of light is 300,000 km/s.) _______A) 18 million kmB) 1.08 billion kmC) 300,000 kmD) 9.46 trillion kmE) 100 million km

Answers

Answer:

B 1.08 BILLION

Explanation:

SEE ATTACHMENT

Plz tell me what is dry ice?

Answers

dry ice is carbon dioxide that is cooled to the point of becoming a solid. It then goes through sublimation, which is when something goes from a solid to a gas (this is when it is taken from its freezing temperature

List five factors that may affect the rate of a chemical reaction