All categories

4 years ago

Which of the following is the best explanation of work?

Physics

2 answers:

Mariulka [41]4 years ago

7 0

The correct option is C

diamong [38]4 years ago

5 0

Work occurs when a force acts on an object and causes a displacement of that object.

∴work=force×displacement

w=f×s

You might be interested in

AlBr3 + K2SO4 → KBr + Al2(SO4)3

STALIN [3.7K]

On the left, you have

1 Al
3 Br
2 K
1 S
4 O

while on the right, you have

1 K
1 Br
2 Al
3 S
12 O

To get a balanced equation, you'll need 6 KBr on the right, which would require 2 AlBr3 and 3 K2SO4 on the left, so you end up with

$2\,\mathrm{AlBr}_3+3\,\mathrm K_2\mathrm{SO}_4\to6\,\mathrm{KBr}+\mathrm{Al}_2(\mathrm{SO}_4)_3$

6 0

3 years ago

Read 2 more answers

A gazelle leaps from a cliff 2.5 m high with a speed of 5.6m/s.

trapecia [35]

Initial speed of Gazelle is along x direction and its value will be

$v_x = 5.6 m/s$

also its initial height is given as

$y = 2.5 m$

Part a)

now from kinematics along Y direction

$\Delta y = v_y t + \frac{1}{2} at^2$

as we know that

$\Delta y = 0$

$v_y = 0$

$a = 9.8 m/s^2$

$2.5 = 0 + \frac{1}{2} (9.8) t^2$

$t = 0.714 s$

Part b)

distance moved horizontally

$\Delta x = v_x t$

as we know that

$v_x = 5.6 m/s$

now we will have

$v_x = 5.6 (0.714) = 4m$

so it will lend at distance of 4 m.

Part c)

final velocity in vertical direction

$v_{fy} = v_y + at$

$v_{fy} = 0 + (9.8)(0.714) = 7 m/s$

$v_x = 5.6 m/s$

so net speed will be

$v^2 = v_x^2 + v_y^2$

$v^2 = 7^2 + 5.6^2$

$v = 8.96 m/s$

7 0

4 years ago

What is gravity. In your own words

torisob [31]

Answer:

a force that pushes down on things

3 0

3 years ago

Read 2 more answers

A hand pump is being used to inflate a bicycle tire that has a gauge pressure of 59.0 lb/in2. If the pump is a cylinder of lengt

bagirrra123 [75]

Answer:

∴The air cannot be made to flow in with the given pump at the given conditions.

Explanation:

Given:

gauge pressure of bicycle tyre, $P_g=59\ lb.in^{-2}$

length of cylinder of the pump, $l=17.4\ in$

area of the the cylinder of the pump, $a= 3\ in^2$

we have the density of air at STP, $\rho=4.4256\times 10^{-5}\ lb.in^{-2}$

The piston must be pushed more than the pressure inside the tyre:

$P_g=\rho\times V\div a$

$59=4.4256\times 10^{-5}\times a\times h\div a$

$h=13.33\times 10^5\ in$

∴The air cannot be made to flow in with the given pump at the given conditions.

4 0

3 years ago

A student placed a pencil in a cup of water. The pencil appears broken because light- always travels in a straight line makes th

il63 [147K]

<span>None of the choices makes a correct statement. The third choice is close,
but misleading.

The pencil appears broken because light bends away from a straight line
when it crosses the boundary between air and water.</span>

5 0

3 years ago

Read 2 more answers