Recall that the height of an object t seconds after it begins moving when gravity is the only force acting on the object is given. h(t)=-16x^2 + v0t + h0. h(t) is given in feet. v0 = initial velocity of object in ft/sec. ho= initial height of object in feet. If the feather is dropped from the top of the bridge 90 feet above a river, how long does it take the feather to reach the water?

Answers

Answer 1

Answer: That's pretty easy, have a look :

$h(t)=−16x2=v0t+h0$
$v0=0 ft/sec$
$h0=90 ft$

The only thing you need to do is to find t and the problem is solved.

Answer 2

Answer:

Answer:

Time taken, t = 2.37 seconds

Explanation:

It is given that,

Height of an object at time t is given by :

$h(t)=-16t^2+v_0t+h_0$

Where

v₀ is initial velocity of object

h₀ is initial height of the object

The feather is dropped from the top of the bridge 90 feet above a river. we have to find the time taken by the feather to reach the water.

At the surface of water, h(t) = 0 and v₀t = 0

So, $0=-16t^2+0+90$

t = 2.37 seconds

The feather will take 2.37 seconds to reach the water surface.

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Which illustration represent the substance at a higher temperature? Explain.

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Answer:

Explanation:

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A student throws a rock horizontally from the edge of a cliff that is 20 m high. The rock has an initial speed of 10 m/s. If air resistance is negligible, the distance from the base of the cliff to where the rock hits the level ground below the cliff is most nearlya.5m
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Answers

Answer:

c.20

Explanation:

1. In which medium does sound travel the fastest? a. salt water
b. fresh water
c. air
d. cast iron

2. A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed?
a. 50 mm/s
b. 50 hertz/s
c. 2 mm/s
d. 0.50 mm/s

3. How does reflection differ from refraction and diffraction?
a. Reflection is the only process in which the wave does not continue moving forward.
b. Reflection is the only process that involves a change in the wave.
c. Reflection affects all types of mechanical waves, but refraction and diffraction do not.

Answers

Answer : 1. cast iron

2. 50 mm/s

3. Reflection is the only process in which the wave does not continue moving forward.

Explanation :

1. The speed of sound is greatest in solid. So, the speed of the sound is fastest in cast iron. It is approximately equal to 4600 m/s.

2. Wavelength, λ = 10 mm

Frequency, υ = 5 Hz

Speed = wavelength × frequency

Speed = 10 mm × 5 s⁻¹

Speed, s = 50 mm/s

3. The bouncing back of light is called the reflection of light. In this process, the wave does not continue moving forward.

1- CAST IRON

2- 50 mm/s

3- Reflection is the only process in which the wave does not continue moving forward.

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