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MariettaO [177]
3 years ago
6

A toy train engine rests motionless on a track. One student begins pushing the engine to the right with a force of 2 newtons. At

the same time, another student begins to push the engine to the left with a force of 5 newtons. Which of the following best describes the motion of the engine?
a
It travels left at a constant speed.
b
It travels left at an increasing speed.
c
It travels right at a constant speed.
d
It travels right at an increasing speed.
Physics
1 answer:
Svetradugi [14.3K]3 years ago
8 0
I think it’s B

Hope it helps
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A neutral atom of tin (Z = 50) has 69 neutrons. (a) How many protons does it have? (b) What is its mass number?
Olenka [21]

Answer:

Protons = 50

Mass number = 119

Explanation:

A neutral of tin, Sn, has a Z value of 50 and neutrons are 69.

Z is the atomic number. The atomic number is equal to number of protons or number of electrons in an atom that is neutral i.e:

Z = PROTONS = ELECTRONS

So the number of protons = 50 since Z is 50

>>>>>>>>>>>>>>>¦

The bulk of the mass of an atom is concentrated in the nucleus. To calculate mass number, we simply sum all the elementary particles in the nucleus i.e protons and neutrons. These particles are called the nucleons.

Mass number (A) = P + N

= 50 + 69

= 119

3 0
3 years ago
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prohojiy [21]

Answer:D

Explanation:

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What amount of heat is required to raise the temperature of 25 grams of copper to cause a 15ºC change? The specific heat of copp
Lina20 [59]

The amount of heat required is B) 150 J

Explanation:

The amount of heat energy required to increase the temperature of a substance is given by the equation:

Q=mC\Delta T

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m is the mass of the substance

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\Delta T is the change in temperature of the substance

For the sample of copper in this problem, we have:

m = 25 g (mass)

C = 0.39 J/gºC (specific heat capacity of copper)

\Delta T = 15^{\circ}C (change in temperature)

Substituting, we find:

Q=(25)(0.39)(15)=146 J

So, the closest answer is B) 150 J.

Learn more about specific heat capacity:

brainly.com/question/3032746

brainly.com/question/4759369

#LearnwithBrainly

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algol13

Answer:

I assume the higher notes would make the rice vibrate more easily, so a flute.

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