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madam [21]
4 years ago
7

If an object is at rest would there be any forces acting upon it?

Physics
2 answers:
Marat540 [252]4 years ago
7 0
Yes gravity would be the force that is holding that object down
ValentinkaMS [17]4 years ago
3 0
Well, it seems as though there would be no forces, because it's "at rest", but wouldn't gravity still be acting upon it?
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A 60 kg skydiver is falling at a terminal velocity of 50 m/s.
marishachu [46]

Answer:

The gravitational force is definitely acting downwards towards the ground and this is equal to the weight of the skydiver.

the acceleration a = 7.8 m/s²

Explanation:

Given that :

the mass of the skydiver = 60 kg

Velocity = 50 m/s

Thus;  gravitational force is definitely acting downwards towards the ground and this is equal to the weight of the skydiver.

Also; the air resistance is acting upward and the resultant of both forces = mass×acceleration

So;

mg-R = ma

60(9.8) - 120 = 60(a)

588 -120 = 60a

468 = 60a

a = \frac{468}{60}

a = 7.8 m/s²

Hence, the acceleration a = 7.8 m/s²

5 0
3 years ago
A seed can be round when parents are crossed, scientists refer to the first generation of offspring as
lora16 [44]
Hey there! 

A seed can be round when parents are crossed, scientists refer to the first generation of offspring as F1. <span> This is the first generation of seeds from very different parental types.</span><span>

</span>Thank you!

4 0
4 years ago
Which question cannot be answered through making measurements?
Margarita [4]

Answer: it would be A

Explanation: how are we to measure the air of a square mile

8 0
4 years ago
How large must the coefficient of static friction be between the tires and the road if a car is to round a level curve of radius
maria [59]

Answer:

897

Explanation:

Speed of the car, v = 126 km/h, converting to m/s, we have v = 35 m/s and

Radius of the curve, R = 150 mm = 0.15 m

The centripetal acceleration a(c) is given by the formula = v² / R so that

a(c) = 35² / 0.15

a(c) = 1225 / 0.15

a(c) = 8167 m/s²

The force that causes the acceleration is frictional force = µ m g, where

µ = coefficient of friction

m = the mass of the car and

g = acceleration due to gravity, 9.81

From Newton's law:

µ m g = m a(c) , so that

µ = a(c) / g

µ = 8167 / 9.81

µ = 897

Therefore, the coefficient of static friction must be as big as 897

5 0
3 years ago
7) An apple falls from the tree and the fall is 1.92 seconds. How high up was the apple?
Sergeeva-Olga [200]

Answer:

Ans 171.875 m(according to the units)

Explanation:

As we know,

to find the distance, we need to use this eqn..

speed = distance/ time

So, time is 1.92 s (as given)

the speed is 330 m/s ( in air speed)

so to find it is easy to find by using this

eqn..

speed =distance/time

330 =distance/1.92

330/1.92 =distance

171.875 = distance

6 0
2 years ago
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