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3 years ago

2 7.42 X 10 What is the scientific notation for this equation

Physics

1 answer:

galben [10]3 years ago

6 0

Answer:

7 42 x 10^1

Explanation:

Because 10 x 1 =10

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The Moon has a radius of 1.7 × 106 m and a mass of 7.3 × 1022 kg. Find the gravitational field on the surface of the Moon.

Lisa [10]

Answer:

10.7* $10^{6}$

Explanation:

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3 years ago

A person slaps her leg with her hand, which results in her hand coming to rest in a time interval of 2.75 ms from an initial spe

bazaltina [42]

Answer:

1350N

Explanation:

$2.75 ms = 2.75*10^{-3}s$

The force exerted on the hand would be the momentum divided by the duration of contact.

As the hand is coming to rest, final velocity would be 0

$F = \frac{\Delta P}{\Delta t} = \frac{m(0 - v)}{\Delta t} = \frac{1.65*(2.25 - 0)}{2.75 * 10^{-3}} = -1350 N$

The magnitude of the force would be 1350N

5 0

3 years ago

Boyle's Law states that when a sample of gas is compressed at a constant temperature, the pressure P and volume V satisfy the eq

gayaneshka [121]

Answer:

The volume is decreasing at 160 cm³/min

Explanation:

Given;

Boyle's law, PV = C

where;

P is pressure of the gas

V is volume of the gas

C is constant

Differentiate this equation using product rule:

$V\frac{dp}{dt} +P\frac{dv}{dt} = \frac{d(C)}{dt}$

Given;

$\frac{dP}{dt}$ (increasing pressure rate of the gas) = 40 kPa/min

V (volume of the gas) = 600 cm³

P (pressure of the gas) = 150 kPa

Substitute in these values in the differential equation above and calculate the rate at which the volume is decreasing ( $\frac{dv}{dt}$ );

(600 x 40) + (150 x $\frac{dv}{dt}$ ) = 0

$\frac{dv}{dt} = -\frac{(600*40)}{150} = -160 \ cm^3/min$

Therefore, the volume is decreasing at 160 cm³/min

3 0

3 years ago

An object is dropped from a 145 m ledge. How fast it is moving just before it hits the ground

LuckyWell [14K]

D = 1/2 x g × t²
145 = 1/2 × 9.8 × t²
t = 5.4 s

8 0

3 years ago

When you lift a book from the ground to your desk, what kind of work do you do negative or positive by lifting the book what do

skelet666 [1.2K]

It would be kinetic energy. Let's say the book is weighs 10 Newtons you need to use a force of 10 Newtons to lift the book. In other words it's positive. As you move the book you're giving it energy. Namely potential energy which will turn to kinetic energy if you let it go. So you're changing it's position and energy.

7 0

4 years ago