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monitta
3 years ago
9

A ball is thrown at 60 degrees and lands in 18.5 seconds what is the velocity of the ball at the start

Physics
1 answer:
n200080 [17]3 years ago
3 0

Answer:

the initial velocity of the ball is 104.67 m/s.

Explanation:

Given;

angle of projection, θ = 60⁰

time of flight, T = 18.5 s

let the initial velocity of the ball, = u

The time of flight is given as;

T = \frac{2u\times sin(\theta)}{g} \\\\2u\times sin(\theta) = Tg\\\\u = \frac{Tg}{2\times sin(\theta)} \\\\u = \frac{18.5 \times 9.8}{2\times sin(60^0)} \\\\u = 104.67 \ m/s

Therefore, the initial velocity of the ball is 104.67 m/s.

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An automobile tire is filled with air at a pressure of 27.0 lb/in2 at 25°C. A cold front moves through and the temperature drops
Softa [21]

Answer:

P_2=25.18\ lb/in^2

Explanation:

Given that

P₁=27 lb/in² ,T₁=25⁰C=273+25 = 298 K

T₂=5⁰C = 273 + 5  = 278 K

Lets take final pressure = P₂

We know that if volume of the gas is constant then we can say that

\dfrac{P_2}{P_1}=\dfrac{T_2}{T_1}

P_2=P_1\times \dfrac{T_2}{T_1}

Now by putting the value in the above equation

P_2=27\times \dfrac{278}{298}\ lb/in^2

P_2=25.18\ lb/in^2

Therefore the new tire pressure will be

P_2=25.18\ lb/in^2

7 0
3 years ago
How many nuclear power plants exist in new jersey?
GuDViN [60]
Nuclear power plants in New Jersey are:
- Hope Creek,
- Oyster Creek,
- Salem.
Oyster Creek is the oldest. It was built in 1969. Salem was built in 1977 and 1979 ( the 2nd unit ). Hope Creek was built in 1986.
Answer: There are 3 nuclear plants in New Jersey.
4 0
3 years ago
Read 2 more answers
If an object has a kinetic energy of 30 j and mass of 34kg how fast is the object moving ?
cricket20 [7]

Ek = (m*V^2) / 2 where m is mass and V is speed, then we can take this equation and manipulate it a little to isolate the speed.

Ek = mv^2 / 2 — multiply both sides by 2

2Ek = mv^2 — divide both sides by m

2Ek / m = V^2 — switch sides

V^2 = 2Ek / m — plug in values

V^2 = 2*30J / 34kg

V^2 = 60J/34kg

V^2 = 1.76 m/s — sqrt of both sides

V = sqrt(1.76)

V = 1.32m/s (roughly)

3 0
3 years ago
A-delta fibers : A) are small, myelinated fibers. B) transmit pain signals at a slower rate than C-fibers. C) typically transmit
daser333 [38]

Answer:

A

Explanation:

Aδ fibers carry cold, pressure, and acute pain signals, and because they are thin (2 to 5 μm in diameter) and myelinated, they send impulses faster than unmyelinated C fibers, but more slowly than other, more thickly myelinated group A nerve fibers. Their conduction velocities are moderate.

7 0
3 years ago
During anomalous expansion of water ,heat transfer is limited to conduction and radiation only ,explain.​
aalyn [17]

Heat transfer is limited to conduction and radiation only in anomalous expansion of water simply because of the temperature at which the expansion occurs and density

<h3>What is anomalous expansion of water?</h3>

Anomalous expansion of water is a property of water in which water expands instead of contracting.

  • Anomalous expansion of water makes water less dense.
  • The major effect of this anomalous expansion it will still remain less dense and at the surface of water.
  • Interestingly, this expansion occurs when it is cooled from 4°C to 0°C.

Learn more about properties of water:

brainly.com/question/18681949

4 0
2 years ago
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