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morpeh [17]
3 years ago
15

Calculate the speed of an object that travels 75m in 15s.

Physics
2 answers:
Afina-wow [57]3 years ago
4 0
11.1847 is what I got, sorry if I’m wrong
sammy [17]3 years ago
3 0

Answer:

v = 5 m/s

Explanation:

v = Δs/t

v = (75 - 0) / 15

v = 5 m/s

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Explanation:

D

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List at least five examples of minerals and their common uses.
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Answer:

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Chromite

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Explanation:

Hope that helps :)

4 0
3 years ago
A fl oor polisher has a rotating disk that has a 15-cm radius. The disk rotates at a constant angular velocity of 1.4 rev/s and
N76 [4]

Answer:

59.4 meters

Explanation:

The correct question statement is :

A floor polisher has a rotating disk that has a 15-cm radius. The disk rotates at a constant angular velocity of 1.4 rev/s and is covered with a soft material that does the polishing. An operator holds the polisher in one place for 4.5 s, in order to buff an especially scuff ed area of the floor. How far (in meters) does a spot on the outer edge of the disk move during this time?

Solution:

We know for a circle of radius r and θ angle by an arc of length S at the center,

S=rθ

This gives

θ=S/r

also we know angular velocity

ω=θ/t    where t is time

or

θ=ωt

and we know

1 revolution =2π radians

From this we have

angular velocity ω = 1.4 revolutions per sec =  1.4×2π radians /sec = 1.4×3.14×2×= 8.8 radians / sec

Putting values of ω and time t in

θ=ωt

we have

θ= 8.8 rad / sec × 4.5 sec

θ= 396 radians

We are given radius r = 15 cm = 15 ×0.01 m=0.15 m (because 1 m= 100 cm and hence, 1 cm = 0.01 m)

put this value of θ and r  in

S=rθ

we have

S= 396 radians ×0.15 m=59.4 m

7 0
3 years ago
Read 2 more answers
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krok68 [10]

The answer is B. Scientific Law

6 0
3 years ago
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How do organisms get the energy they need​
matrenka [14]

Answer:

consumers get energy from eating other things plant from sun

Explanation:

8 0
3 years ago
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