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Tju [1.3M]
3 years ago
12

How many hydrogen atoms are there in 2 molecules of PH3?

Physics
1 answer:
atroni [7]3 years ago
7 0
6 because there are 2 molecules and each has 3 hydrogen atoms.
Therefore 2*3=6.
Hope this helps!
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The voltage in a battery is 9 volts. The resistance is 3 ohms.<br><br> What is the current?
earnstyle [38]
Current = V/R = 9/3 = 3A
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3 years ago
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Suppose you wanted to hold up an electron against the force of gravity by the attraction of a fixed proton some distance above i
Mice21 [21]

Answer:

r = 5.08 m

Explanation:

The electric force of attraction or repulsion is given by :

F=\dfrac{kq_1q_2}{r^2}

We need to find how far above the electron would the proton have to be if you wanted to hold up an electron against the force of gravity by the attraction of a fixed proton some distance above it.

So, the force from the proton is balanced by the mass of the electron.

\dfrac{kq_pq_e}{r^2}=mg

r is distance

r=\sqrt{\dfrac{kq_pq_e}{mg}} \\\\r=\sqrt{\dfrac{9\times 10^9\times (1.6\times 10^{-19})^2}{9.11\times 10^{-31}\times 9.8}} \\\\r=5.08\ m

So, proton have to be at a distance of 5.08 meters above the electron.

3 0
3 years ago
You are given two carts, a and
Aloiza [94]
The mass of a is smaller than the mass of b.
3 0
3 years ago
Jill applies a force of 250 N to a machine. The machine applies a force of 25 N to an object. What is the mechanical advantage o
Vinvika [58]

Mechanical advantage is defined as the ratio of output load to the input load. The mechanical advantage of the machine will be 0.1.

<h3>What is mechanical advantage?</h3>

Mechanical advantage is a measure of the ratio of output force to input force in a system,

It is used to obtain the efficiency of forces in levers and pulleys. It is an effective way of amplifying the force in simple machines like levers.

The theoretical mechanical advantage is defined as the ratio of the force responsible for the useful work in the system to the applied force.

Given

applied force = 250 N

Output force = 25

Mechanical advantage = work output / work input

\rm{Mechanical advantage}=\frac{F_O}{F_I}

\rm{Mechanical advantage}=\frac{25}{250}

\rm{Mechanical advantage}=0.1

Hence the mechanical advantage of the machine will be 0.1

To learn more about the mechanical advantage refer to the link;

brainly.com/question/7638820

3 0
2 years ago
A rock is thrown vertically upward from some height above the ground. It rises to some maximum height and falls back to the grou
True [87]

Answer:

At the highest point the velocity is zero, the acceleration is directed downward.

Explanation:

This is a free-fall problem, in the case of something being thrown or dropped, the acceleration is equal to -gravity, so -9.80m/s^2. So, the acceleration is never 0 here.

I attached an image from my lecture today, I find it to be helpful. You can see that because of gravity the acceleration is pulled downwards.

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