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4 years ago

7

How much work is done using a 500 W microwave for 5 minutes

1 answer:

frosja888 [35]4 years ago

6 0

Power = work done/time

work done = power x time

= 500x5x60

= 150000J

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The small piston of a hydraulic lift has a diameter of 8.0 cm, and its large piston has a diameter of 40cm. the lift raises a lo

Elena L [17]

Sm = small piston
la = large piston

P=F/A
P=15000/(20^2)π

F of sm = PA
= (75/2π)•((8^2)π)
= (75•64)/2
= 4800/2
= 2400N
We already know the pressure but giving it in an approximate decimal form, to two significant figures (since that's what your supplied precision is at):

a) 12 Pa
b) 2400 N

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A person's weight will be greater on Jupiter than on earth

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How fast must a 1000 kg car be moving to have a kinetic energy of:

VMariaS [17]

Answer:

$\mathrm{(a)}\: 2\: \mathrm{m/s}\\\mathrm{(b)}\: 20\: \mathrm{m/s}\\$

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The kinetic energy of an object is given by $KE=\frac{1}{2}mv^2$ where $m$ is the mass of the object and $v$ is the velocity of the object.

We can set up the following equations with the information given:

$\mathrm{(a)}\: 2.0\cdot 10^3=\frac{1}{2}\cdot 1000\cdot v^2, \\v=\fbox{$2\: \mathrm{m/s}$}$

For part B, we have the same equation, but kinetic energy is now $2.0\cdot 10^5$ .

Therefore:

$\mathrm{(b)}\: 2.0\cdot 10^5=\frac{1}{2}\cdot 1000\cdot v^2, \\v=\fbox{$20\: \mathrm{m/s}$}$ .

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3 years ago

5. Confirm dimensionally that the product (lvp/n) is

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Answer:

How do you do it?

Explanation:

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3 years ago

The potential in a region between x = 0 and x = 6.00 m is V = a + bx, where a = 10.6 V and b = -4.90 V/m. (a) Determine the pote

cestrela7 [59]

Answer:

a) 10.6V

b) E = 4.9V/m, +x direction

c) E = 4.9V/m, +x direction

Explanation:

You have the following function:

$V=a+bx$ (1)

for the potential in a region between x=0 and x=6.00 m

a = 10.6 V

b = -4.90V/m

$V=10.6V-4.90\frac{V}{m}x$

a) for x=0 you obtain for V:

$V=10.6V-4.90\frac{V}{m}(0m)=10.6V$

b) The relation between the potential difference and the electric field can be written as:

$E=-\frac{dV}{dx}=-b=-(-4.9V/m)=4.9V/m$ (2)

the direction is +x

c) The electric field is the same for any value of x between x=0 and x=6m.

Hence,

E = 4.9V/m, +x direction

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4 years ago