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Lilit [14]
4 years ago
13

A ball is thrown horizontally from a platform so that the initial height of the ball is 6.0 m above the level ground below. The

ball lands 24 m from its original horizontal location. Find how fast the ball was thrown. Show all work.
Physics
1 answer:
solniwko [45]4 years ago
5 0
We can first obtain time of flight from vertical fall
Initial velocity U=0, d = 6 m, a = 9.8 m/s² 
d = ut + 1/2 at²
6.0 = 0 + (1/2 × 9.80 t²) 
t = √(12/9.8)
 = 1.106 sec
Horizontal velocity = Vh = Dh/t
  = 24.0 /1.106 s
  = 21.69 m/s
The ball was thrown at a speed of 21.69 m/s
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jeyben [28]

Answer:

θ_c = 24.4º

Explanation:

To find the critical angle, let's use the law of refraction where index 1 refers to the incident medium (diamond) and index 2 refers to the medium where it is to be refracted (air)

          n₁ sin θ₁ = n₂ sin θ₂

for the critical angle the ray comes out refracted parallel to the surface, therefore the angle is

         θ₂ = 90

        n₁ sin θ₁ = n₂

        θ_c = θ₁ = sin⁻¹ \frac{n_2}{n_1}

the index of refraction of the diamond is tabulated

       n₁ = 2.419

let's calculate

          θ_c = sin⁻¹ (\frac{1}{2.419})

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7 0
3 years ago
Question 4 of 11
givi [52]

Answer: C

C. Place plastic around the metal wires, because electric charges

hardly move in plastic.

4 0
3 years ago
A cable weighing 0.6 pounds per foot is attached to a small 70-pound robot, and then the robot is lowered into a 50-foot deep we
Sav [38]

Answer:

4600 ft.Ibs

Explanation:

Work done by the robot in climbing to the top of the well = work done in carrying the cable and itself + work done in carrying about average half the mass of the cable attached to the robot

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8 0
4 years ago
In getting ready to slam-dunk the ball, a basketball player starts from rest and sprints to a speed of 4.82 m/s in 1.98 s. Assu
Ann [662]
Great equation: distance = rate*time

So, distance run = 4.82 meters/second * 1.98 seconds = 9.5436 meters (round according to whatever the problem specifies, usually to the tenths or hundredths is sufficient).

This makes sense if you think about it since you are multiplying seconds with meters over seconds. The seconds cancel out, leaving you only the meters.
7 0
3 years ago
What is the density of a 200 gram mass whose volume is 300 cm?
inn [45]

Answer:

0.667 grams per cm cubed

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