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3 years ago

9

Which one of the following is not a simple machine

2 answers:

Vladimir [108]3 years ago

8 0

4.) an electric pole is not a simple machine

PilotLPTM [1.2K]3 years ago

3 0

Answer:

4 electric pole is the answer.

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Janetta ran a campaign for student body president, and she really wanted to win. She gave election buttons to everyone and told

SVEN [57.7K]

Answer:

No, because she is hoping that people will vote for her.

Explanation:

Altruism is when you do something for others and have very little expectation of getting something in return. In this case, Janetta expected something in return from her friends. We may not also be sure of the sincerity of Janetta appreciating friendship. From the above definition of altruism, we conclude that Janetta's actions are not altruistic because she hoped that people will vote for her.

3 0

3 years ago

If you could visit Pangaea, what animals would you most likely find there?

katen-ka-za [31]

1B
2D
3C
4A
5B
6D
7B
8C
9A
10C

5 0

4 years ago

Read 2 more answers

The kinetic energy of a 10-kilogram object is 2000 joules. What is the speed of the object, in m/s?

Svetllana [295]

Answer:

<u><em>20 m/s.</em></u>

Explanation:

Mass of body m: 10kg

The kinetic energy of the body is given as; $K.E= \frac{1}{2} * m * v^{2}$

Value of Kinetic energy K.E = 2000 Joules

V is the body's velocity, and M is the body's mass.

Calculating the value of velocity; $V=\frac{\sqrt{2K*E} }{m}$ $V= \frac{\sqrt{2*2000} }{10}$ = $V=20m/s$

Velocity maintained by the body having a kinetic energy of 2000J is

20 m/s.

6 0

2 years ago

Backpackers often use canisters of white gas to fuel a cooking stove's burner. If one canister contains 1.45 L of white gas, and

lorasvet [3.4K]

Answer: One canister contains 1.03 Kg of fuel,

Explanation:

The density is defined as the relation between the mass and the volume $p=\frac{m}{v}$

First of all you need to have the same units for volume and density, so:

For the volume,

$1.45 L * \frac{1.10*10^{-3}m^{3} }{1 L} = 1.45 *10^{-3} m^{3}$

For the density,

$p = 0.710\frac{g}{cm^{3} } *\frac{1cm^{3} }{1*10^{-6}m^{3} }*\frac{1 Kg}{1*10^{3}g } = 710\frac{Kg}{m^{3} }$

From the density equation we have $m=p*v$ , so:

$710\frac{Kg}{m^{3} } *1.45*10^{-3} m^{3} = 1.03Kg$

4 0

4 years ago

Two identical loudspeakers that are 5.00 m apart and face toward each other are driven in phase by the same oscillator at a freq

Lunna [17]

Answer:0.0982 m

Explanation:

Given

distance between two loudspeaker is 5 m

frequency (f )=875 Hz

speed of sound (v)=344 m/s

Let $x_0$ be the smallest distance moved by observer then

Position of observer w.r.t to first speaker is

$x_1=\frac{L}{2}-x_0$

Position of observer w.r.t to second speaker is

$x_2=\frac{L}{2}+x_0$

$\Delta x=2x_0$

For Destructive interference

$\Delta x=\left ( m+\frac{1}{2}\right )\cdot lambda$

For minimum m=0

and $\lambda =\frac{v}{f}$

$2x_0=\frac{v}{2f}$

$x_0=\frac{v}{4f}=\frac{344}{4\times 875}=0.0983 m$

8 0

3 years ago