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dsp73
2 years ago
8

A net force must be acting when an object Choose one or more: A. changes direction but not speed. B. changes both speed and dire

ction. C. accelerates. D. changes speed but not direction.
Physics
1 answer:
Dafna11 [192]2 years ago
5 0

Answer:

C. accelerates.

D. changes speed but not direction.

Explanation:

• When the body accelerates, the net force increases, when changes speed, acceleration changes and force as well.

{ \rm{force = mass \times acceleration}}

» So, the force is determined by acceleration.

{ \rm{force = mass \times ( \frac{ \delta \: speed}{time}) }} \\

» Also force is determined by change in speed

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katen-ka-za [31]

Answer:

22.505 seconds

Explanation:

V =19.8m/s

V = a*to

t1 = 19.8/3.3

= 6seconds

Distance travelled during acceleration

= 1/2 x 3.3 x 6²

= 59.4m

X_total = x1 + x2

X2 = 373-59.4

X2 = 313.6m

t2 = x2/v

= 313.6/19.8

= 16.505

Total = 16.505 + 6

= 22.505 seconds

the minimum time in which an elevator can travel the 373 m from the ground floor is 22.505 seconds.

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The first scientist to introduce the concept of inertia was Galileo
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Answer:

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2 years ago
A 120 V potential difference is applied to a space heater that dissipates 674 W during operation. (a) What is its resistance dur
Annette [7]

Answer:

(a) 21.36 ohms

(b) 5.62 A

Explanation:

Parameters given:

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Power, P = 674 W

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R = 120²/674

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(b) Power is also given as:

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Where I = Current (time rate of flow of Electric charge)

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I = 674/120

I = 5.62 A

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2 years ago
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3 years ago
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