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valina [46]
3 years ago
12

Sallys physical education teacher timed her run and recorded the time and distance in the table below. What is her average speed

?
Time (s) : 1, 2, 3, 4, 5
Distance (m) : 2, 5, 7, 10, 12
A) 3 m/s
B) 2.5 m/s
C) 2 m/s
D) 4 m/s
Physics
1 answer:
Fudgin [204]3 years ago
4 0
Answer: B) 2.5 m/s

Explanation: Find the average of the time and distance, and see how far they go in only 1 second.


1 + 2 + 3 + 4 + 5 = 15
15 divided by 5 = 3

3 seconds

2 + 5 + 7 + 10 + 12 = 36
36 divided by 5 = 7.2


7.2m per 3 seconds.

7.2 divided by 3 = 2.4

Therefore, the answer is technically 2.4m/s
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A person began running due east and covered 15 km in 2.0 hr. What is the average velocity of the person?
g100num [7]
Velocity = distance / time

v = (15*1000)m / (2*60*60)s

v=2.08 m / s
6 0
3 years ago
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A slab of glass 8.0 cm thick is placed upon a printed page. If the refractive index of the glass is 1.5, how far from the surfac
7nadin3 [17]

Answer:

5.3 cm

Explanation:

This question is an illustration of real and apparent distance.

From the question, we have the following given parameters

Real Distance, R = 8.0cm

Refractive Index, μ = 1.5

Required

Determine the apparent distance (A)

The relationship between R, A and μ is:

μ = R/A

i.e.

Refractive Index = Real Distance ÷ Apparent Distance

Substitute values in the above formula

1.5 = 8/A

Multiply both sides by A

1.5 * A = A * 8/A

1.5A = 8

Divide both side by 1.5

1.5A/1.5 = 8/1.5

A = 8/1.5

A = 5.3cm

Hence, the letters would appear at a distance of 5.3cm

8 0
2 years ago
Please help im being timed on this and need to get my grade up
nadya68 [22]

Answer:

a I think hope this helps

8 0
2 years ago
Mr Jones launches an arrow horizontally at a rate of 40m/s off of a 78.4 m cliff towards the south, how far south does the arrow
DanielleElmas [232]

Answer:c

Explanation:its the answer because its the answer

4 0
2 years ago
Calculate the fraction of methyl isonitrile molecules that have an energy of 160.0 kJ or greater at 510 K .
soldi70 [24.7K]

Answer:

4.0932672025\times 10^{-17}

Explanation:

E_a = Activation energy = 160 kJ

T = Temperature = 510 K

R = Universal gas constant = 8.314 J/mol K

The fraction of energy is given by

f=e^{-\dfrac{E_a}{RT}}\\\Rightarrow f=e^{-\dfrac{160000}{8.314\times 510}}\\\Rightarrow f=4.0932672025\times 10^{-17}

The fraction of energy is 4.0932672025\times 10^{-17}

3 0
3 years ago
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