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vampirchik [111]
3 years ago
13

A ball rolling down a hill for 9 seconds accelerates from 3 m/s to 34.5 m/s. What is the ball's rate of acceleration?

Physics
1 answer:
Delicious77 [7]3 years ago
4 0

Answer:njjikkmokkmmm

Explanation:

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maksim [4K]

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wait what do you mean? And why is this in physics?

Is this about the iron dome or something biblical?

Explanation:

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3 years ago
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A hydraulic turbine is used to generate power by using the water in a dam. The elevation difference between the free surfaces up
Serjik [45]

Answer:

0.906

Explanation:

Let g = 9.81 m/s2. We can calculate the rate of change in potential energy when m = 201kg of water is falling down a distance of h = 131m per second

\dot{E_p} = \dot{m}gh = 201*9.81*131 = 258307 J/s (W) = 258.307 kW

So the efficiency of the water turbine is the ratio of output power over input power:

\frac{234}{258.307} = 0.906

3 0
3 years ago
10.A car is travelling at a constant speed of 27m/s. The driver looks away from the road for a 2.0s to tune in a station on the
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Explanation:

Distance = speed × time

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d = 54 m

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3 years ago
What is the speed of a wave with 3Hz frequency and a wavelength of 9 m
SIZIF [17.4K]

Answer:

Given

Frequency (f) = 3Hz

Wavelength = 9 m

Speed = ?

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we know

Speed = wavelength * frequency

= 9*3

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7 0
3 years ago
How many electrons are in an electrically neutral atom of boron? A) 3 B) 5 C) 6 D) 8
Hoochie [10]
B. five electrons

If you want an explanation, here it is.

The atomic number gives the number of protons. Protons which have a positive charge are balanced by an equal number of electrons in a neutral atom. Boron number 5 has five protons and therefore as a neutral atom also has five electrons.
8 0
3 years ago
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