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melomori [17]
3 years ago
12

What is the average velocity of the object between 14 and 22 seconds

Physics
2 answers:
anastassius [24]3 years ago
4 0
Use the slope equation. It’s 1-8 Meters which is 7. And it’s 22-14 seconds. So the answer is d

Natalka [10]3 years ago
4 0

Answer:

v = - 0.88 m/s

Explanation:

Average velocity is defined as the ratio of displacement and time

so here as we can see that the displacement is the change in the position of the object

initially object is placed at x = 8 m

final position of the object is x = 1

so the displacement is given as

d = x_f - x_i

d = 1 - 8 = -7 m

now the time taken by the object

\Delta t = 22 - 14 = 8 s

now by the formula of average velocity we know

v = \frac{displacement}{time}

v = \frac{-7}{8} = - 0.88 m/s

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malfutka [58]

In order to determine the acceleration of the block, use the following formula:

F=ma

Moreover, remind that for an object attached to a spring the magnitude of the force acting over a mass is given by:

F=kx

Then, you have:

ma=kx

by solving for a, you obtain:

a=\frac{kx}{m}

In this case, you have:

k: spring constant = 100N/m

m: mass of the block = 200g = 0.2kg

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Replace the previous values of the parameters into the expression for a:

a=\frac{(\frac{100N}{m})(0.02m)}{0.2\operatorname{kg}}=10\frac{m}{s^2}

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1 year ago
How has technology influenced theories over time?
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Better technology is helping us because we can see more stuff like the microscope we able to make assumptions based on what we saw.  
7 0
3 years ago
A high diver dives into a swimming pool. His potential energy at the top is 10,000 J (relative to the surface of the pool). What
Semmy [17]

Answer:

Kinetic energy of diver at 90% of the distance to the water is 9000 J

Explanation:

Let d is the distance between the position of the diver and surface of the pool.

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As the diver dives towards the pool, its potential energy is converting into kinetic energy due to law of conservation of energy, as total energy of the system remains same.

Energy before diving = Energy during diving

(Potential Energy + Kinetic Energy) =  (Kinetic Energy +  Potential Energy)

When the diver reaches 90% of the distance to the water, its kinetic energy

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3 years ago
Why do hot stars look bluer than cool stars?
brilliants [131]

Answer:

(B) The wavelength that a star radiates the most energy is inversely proportional to the temperature.

Explanation:

As we know that

According to Wien's law wavelength is inverse proportional to the temperature .

  λ.T = Constant.

λ.∝ 1 /T

As we know that star radiates wavelength and this wavelength is inverse proportional to the temperature of the star.

The temperature of cool star is cooler than the temperature of hot star that is cool star looks red and hot star looks blue.Cool star have low energy and hot star have high energy.

So option B is correct.

(B) The wavelength that a star radiates the most energy is inversely proportional to the temperature.

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