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3 years ago

8

Differences between Pressure and upthrust

1 answer:

Angelina_Jolie [31]3 years ago

4 0

Answer:

Pressure is equal to the ratio of thrust to the area in contact. Upthrust is a force exerted by the fluids on an object placed in the fluid . Upthrust acts in upward direction.

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What is the hydrostatic pressure at 20,000 leagues under the sea? (a league is the distance a person can walk in one hour) ?) 40

TiliK225 [7]

Answer:

alternative E- none of these answers

Explanation:

Hydrostatic pressure is the pressure exerted by a fluid at equilibrium at a given point within the fluid, due to the force of gravity. Hydrostatic pressure increases in proportion to depth measured from the surface because of the increasing weight of fluid exerting downward force from above.

The formula is :

P= d x g x h

p: hydrostatic pressure (N/m²)

d: density (kg/m³) density of seawater is 1,030 kg/m³

g: gravity (m/s²) ≅ 9.8m/s²

h: height (m)

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4 years ago

Calculate the work done when a 10 N force pushes against a cart 4.0 m

juin [17]

work = force x distance

10N and 4m gives 40 joules

7 0

3 years ago

Read 2 more answers

A 350-watt vacuum is plugged into a 120-volt outlet and used for 30 seconds. How much current runs through the vacuum? 2.9 amps

myrzilka [38]

Power = (voltage) x (current)

350 watts = (120 volts) x (current)

350 watts / 120 volts = current

current = 2.917 Amperes continuously

3 0

3 years ago

The specific heat of copper is 0.385 J/g•°C. Which equation would you use to calculate the amount of heat needed to raise the te

Pavlova-9 [17]

Answer:

Q = 0.75 g x 0.897 J/g•°C x 22°C

Explanation:

The amount of heat needed to raise the temperature of a substance is given by the equation

$Q=m C \Delta T$

where

m is the mass of the substance

C is the specific heat capacity

$\Delta T$ is the increase in temperature of the substance

In this problem, the mass of the aluminium is m=0.75 g. The specific heat of aluminium is C=0.897 J/g•°C, while the increase in temperature is

$\Delta T=29^{\circ}-7^{\circ}=22 ^{\circ}$

So, the equation becomes

Q = 0.75 g x 0.897 J/g•°C x 22°C

4 0

3 years ago

Read 2 more answers

A shuttle bus slows down with an average acceleration of -2.4 m/s2. How long does it

olganol [36]

Answer:

$\boxed {\boxed {\sf 3.75 \ seconds }}$

Explanation:

Average acceleration is found by dividing the change in acceleration by the time.

$a=\frac{ v_f-v_i}{t}$

The shuttle bus has an acceleration of -2.4 meters per square second. It slows from 9.0 meters per second to rest, or 0 meters per second. Therefore:

$a= -2.4 \ m/s^2 \\v_f= 0 \ m/s \\v_i= 9 \ m/s$

Substitute the values into the formula.

$-2.4 \ m/s^2=\frac{0 \ m/s - 9 \ m/s}{t }$

Solve the numerator.

$-2.4 \ m/s^2 = \frac{-9 \ m/s}{t}$

We want to solve for t, the time. We have to isolate the variable. Let's cross multiply.

$\frac{-2.4 \ m/s^2}{1} = \frac{-9 \ m/s}{t}$

$-9 \ m/s *1= -2.4 \ m/s^2 *t$

$-9 \ m/s=-2.4 m/s^2*t$

t is being multiplied by -2.4. The inverse of multiplication is division, so divide both sides by -2.4

$\frac{-9 \ m/s }{-2.4 \ m/s^2} =\frac{ -2.4 \ m/s^2*t}{-2.4 \ m/s^2}$

$\frac{-9 \ m/s }{-2.4 \ m/s^2} =t$

$3.75 \ s=t$

It takes <u>3.75 seconds.</u>

4 0

3 years ago