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3 years ago

Can u pls help me .....

Physics

1 answer:

andrew-mc [135]3 years ago

5 0

Answer:

the floor absorb the water so the water is dry

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Thank you for your help !

Hoochie [10]

Answer:

I guess the answer was d.The current at P is greater than the current at Q...

3 0

3 years ago

2) Billy jumps upward with a velocity of 4.2 m/s off a 6m high diving board. What is his final velocity once he hits the water?

Yuliya22 [10]

Answer:

The value of the final velocity is $v = 11.6 \ m/s$

Explanation:

Generally from kinematic equation

$v^2 = u^2 + 2as$

Here a is the acceleration which is equivalent to g

$v^2 = u^2 + 2gs$

substituting 6 m for s , 4.2m/s for u

$v^2 = 4.2^2 + 2 * 9.8 * 6$

$v = 11.6 \ m/s$

7 0

4 years ago

Kevin is refinishing his rusty wheelbarrow. He moves his sandpaper back and forth 45 times over a rusty area, each time moving a

dmitriy555 [2]

W = _|....F*dx*cos(a)........With F=force, x=distance over which force acts on object,
.......0.............................and a=angle between force and direction of travel.

Since the force is constant in this case we don't need the equation to be an integral expression, and since the force in question - the force of friction - is always precisely opposite the direction of travel (which makes (a) equal to 180 deg, and cos(a) equal to -1) the equation can be rewritted like so:

W = F*x*(-1) ............ or ............. W = -F*x

The force of friction is given by the equation: Ffriction = Fnormal*(coeff of friction)

Also, note that the total work is the sum of all 45 passes by the sandpaper. So our final equation, when Ffriction is substituted, is:

W = (-45)(Fnormal)(coeff of friction)(distance)
W = (-45)...(1.8N).........(0.92).........(0.15m)
W = ................-11.178 Joules

5 0

4 years ago

A pure copper sphere has a radius of 0.935 in. How many copper atoms does it contain? [The volume of a sphere is (4>3)pr3 and

ValentinkaMS [17]

Answer:

47.68 x 10²³ or 4.768 x 10²⁴ copper atoms

Explanation:

Given:

Radius of the copper sphere (r) = 0.935 in

First convert the radius from inches to centimeters

1 in = 2.54cm

0.935in = 0.935 x 2.54cm = 2.3749cm

∴ r = 2.3749cm

Calculate the volume of the copper sphere as follows

Volume = $\frac{4}{3}\pi r^{3}$ [substitute r = 2.3749cm and π = 22 / 7]

Volume = $\frac{4}{3}(\frac{22}{7} ) (2.3749)^{3}$

Volume = 56.108cm³

From the volume and given density, calculate the mass of the copper sphere

mass = density x volume [density = 8.96g/cm³]

mass = 8.96 x 56.108 = 502.73g

From known facts

1 mole of copper = 63.5g of copper = 6.022 x 10²³ copper atoms.

Then,

502.73 g of copper = $\frac{502.73 * 6.022*10^{23}}{63.5}$ = 47.68 x 10²³ copper atoms

Therefore, the sphere contains 47.68 x 10²³ copper atoms

6 0

4 years ago

Read 2 more answers

I NEED AN ANSWER ASAP PLEASE!!

alina1380 [7]

Answer:

The last one, I believe :)

Explanation:

7 0

3 years ago