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AlekseyPX
3 years ago
11

Which statement about the positive and negative value of speed compared to velocity is true?

Physics
1 answer:
mestny [16]3 years ago
3 0
D is the answer
Velocity maybe negative or positive
while speed is always positive
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A hot air balloon exerts a force of 1200 N while
ValentinkaMS [17]

Answer:

C

Explanation:

For the explained scenario in the free body force diagram definitely the two forces 1200 N and 800 N should present as they are the acting forces

So A & D rules out.

Then you must think of B & C.

You also know that the weight of the load is always acting downwards as that force is generated by gravitational field of Earth. So 800 N should be downwards not upwards. That rules out B.

So answer is C

(Free body diagram is shown in the graph)

4 0
3 years ago
When jumping, a flea rapidly extends its legs, reaching a takeoff speed of 1.0 m/s over a distance of 0.50 mm find acceleration.
Anna [14]

Solution:

In this question we have given,

initial velocity,u = 0

final velocity, v = 1m/s

displacement =.5mm             (Because 1mm=.001m)

We have to find

1.acceleration

2. Time

1. we know third equation of motion is given as,

v^{2} =u^{2} + 2as............(1)

Put values of v,u and s in equation (1)

[tex]s=1^{2} = 0^{2} +2X.0005Xa\\1= .001a\\therefore, a = 1/.001\\ a= 1000m/s^{2}

2. We know First equation of motion is given as

v=u+at......................(2)

put values of v, u and a in equation(2)

1= 0 + 1000t\\t= 1/1000\\t= 0.001s

3 0
3 years ago
What is science? Wrong answers will be deleted.
Gala2k [10]

Answer:

Science is the intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.

Hope it helps you!!

#IndianMurga ツ

3 0
3 years ago
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A zone plate is found to give series of images of a point source on its axis. If the strongest and the second strongest images a
AysviL [449]
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6 0
3 years ago
Suppose you want to operate an ideal refrigerator with a cold temperature of − 15.5 °C , and you would like it to have a coeffic
tensa zangetsu [6.8K]

Answer:

15.65 °C

Explanation:

cold temperature (Tc) = -15.5 degree C = 273.15 - 15.5 = 257.65 kelvin

minimum coefficient of performance (η) = 8.25

find the maximum hot reservoir temperature of such a generator (Th)

η = \frac{Tc}{Th-Tc}

Th = Tc x (\frac{1}{η} + 1)

Th = 257.65 x (\frac{1}{8.25} + 1)

Th = 288.8 K

Th = 288.8 - 273.15 = 15.65 °C

8 0
3 years ago
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