If an object is not accelerating what can you determine about the sum of all the forces on the object

Answers

Answer 1

Answer: If object is not accelerating, the sum of all forces on the object will be equal to ZERO...

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When you whisper, you produce a 10-dB sound.a. When you speak quietly, your voice sounds twice as loud as a whisper. How many decibels is this?
b. When you speak normally, your voice sounds 4 times as loud as a whisper. How many decibels is this?
c. When you yell, your voice sounds 8 times as loud as a whisper. How many decibels is this?

Answers

All you would do is for a, 10 times 2 is 20 so it would be 20-dB
For b, 10 times 4 is 40 so it would be 40-dB
For c, 10 times 8 is 80 so it would be 80-dB

At what speed v will the length of a 1.00 m stick look 13.7 % shorter (86.3 cm )Using formula L=Lp sqrt 1-v^2/c^2

Answers

L= Lp - 13.7*Lp/100 = Lp-0,137Lp = 0,8613Lp

⇒L/Lp = 0.8613

From the formula above L/Lp = √(1-v^2/c^2)

(L/Lp)^2 = 1 - (v^2/c^2)

v^2/c^2 = 1 - (L/Lp)^2

v/c = √[1 - (L/Lp)^2]

v = c √[1-(L/Lp)^2]

v =c√[1-0.8613^2] = 0.508c

In the vacumm speed of light, c, is approx 300,000,000 m/s

v =0.508 (300,000,000m/s) =152,400,000 m/s

Please, let me know if this helped you.

A person uses a screwdriver to turn a screw and insert it into a piece of wood. The person applies a force of 20 newtons to the screwdriver and turns the handle of the screwdriver a total distance of 0.5 meter. How would these numbers be different if the person inserted a nail with a hammer instead of the screw with the screwdriver?A. The force applied would be greater, but the distance would be shorter.

B. The force applied would be less, but the distance would be greater.

C. The force applied would be the same, but the distance would be shorter.

D. The force applied would be the same, but the distance would be greater.

Answers

If the person inserted a nail with a hammer instead of the screw with the screwdriver, the force applied would be greater, but the distance would be shorter. The correct option is A.

What is force?

The action of push or pull in order to make a body change its state of motion or rest is called Force.

As the force is pressure per unit area. Force is inversely proportional to the area over which force is to applied.

The hammer would take more force to insert the nail. The screw has its helix which is to be inserted and application of force is small.

Thus, the force applied would be greater, but the distance would be shorter. The correct option is A.

Learn more about force.

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t if the person inserted a nail with a hammer instead of the screw with the screwdriver?

Removing the dimensional prefix and express in scientific notation ( include unit)7.4nm
6.78 x 10^8 MHz
5.36 x 10^6 kV
1500mA

Calculate the following numbers into scientific notation (include units)

7800nm + 95pm =
2500nm - 7pm =
(65x10^4m) x (4.5x10^-6s-1)=
(24x10^5m) / (2x10^-8s) =

convert the following to the prefix commonly used (use units)
55 000 000 Hz
4.8x10^4V
0.0068s
0.00000000234m

Answers

7.4nm = 7.4 x 10⁻⁹m
6.78 x 10^8 MHz = 6.78 x 10¹⁴ Hz
5.36 x 10^6 kV = 5.26 x 10⁹V
1500mA=1.5 A

7800nm + 95pm = 7800.095 x 10⁻⁹ m
2500nm - 7pm = 2499.993 x 10⁻⁹ m
(65x10^4m) x (4.5x10^-6s-1) = 2.925 m/s
(24x10^5m) / (2x10^-8s) = 1.2 x 10¹⁴ m/s (that's 400,000 'c' !)

55 000 000 Hz = 55 MHz
4.8x10^4V = 48 KV
0.0068s = 6.8 mS
0.00000000234m = 2.34 nm

7.4 x 10^9 m
6.78 x 10^11 Hz
5.36 x 10^9 V
1.5 x 10^3 mA

1nm = 10^9m
and 1pm=10^11m

55MHz
48kV
234pm

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An object of unknown mass is initially at rest and dropped from a height h. It reaches the ground with a velocity v sin θ / g 1. The same object is then raised again to the same height h but this time is thrown downward with velocity υ1 It now reaches the ground with a new velocity υ2. How is v2 related to v1?