PHYSICS HIGH SCHOOL

If a cart of 4 kg mass has a force of 8 newtons exerted on it, what is its acceleration?

Answers

Answer 1

Answer:

Answer:

a=2m/s^2

Explanation:

If a cart of 4 kg mass has a force of 8 newtons exerted on it, what is its acceleration

first foremost, we define basic terms

Mass=is the quantity of matter in a body ,kg

Acceleration= change in velocity per time(m/s^2)

Force= Is that which tends to change a body's state of rest or uniform motion in a straight line.

It is also the pull or push on a body.

From newton's second law of motion which states that rate of change in momentum is proportional to the force applied. Where k=1

Fαm(v/t)

F=km(v/t)

K=1

f=ma

Since v/t= acceleration

velocity/time=accel

8=4a

a=8/4

a=2m/s^2

Answer 2

Answer: M = 4kg
F =8N
a..?

F =m.a
8 = 4.a
a = 2m/s^2

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All atoms of the same element must have the same number of

Answers

Explanation:

Atomic number is defined as the total number of protons present in an element.

Each element of the periodic table has different atomic number because each of them have different number of protons.

For example, atomic number of Na is 11, and atomic number of Ca is 20.

On the other hand, atomic mass is the sum of total number of protons and neutrons present in an atom.

For example, atomic mass of nitrogen is 14 that is, it contains 7 protons and 7 neutrons.

Thus, we can conclude that all atoms of the same element must have the same number of protons.

Answer: Protons

Explanation: The number of protons corresponds to the atomic number.

A pendulum is used in a large clock. The pendulum has a mass of 2kg. If the pendulum is moving at a speed of 4.1m/s when it reaches the lowest point on its path, what is the maximum length of the pendulum?

Answers

There's no way to calculate the length of the pendulum
with the given information.

The only thing we can calculate is the total energy in the pendulum.

When the pendulum is at the bottom of its swing, ALL of its energy
is kinetic.

   Kinetic energy = (1/2) x (mass) x (speed)²

   = (1/2) x (2 kg) x (4.1 m/s)²

   = 4.1 kg-m²/sec²

   = 4.1 Joules .

In principle, we can also calculate how HIGH the 'bob' is at the end of
its swing, because now we know how much total energy the pendulum
has, and at the ends of the swing, the energy is all potential.

   Potential energy = (mass) x (gravity) x (height)

   4.1 J = (2 kg) x (9.8 m/s²) x (height)

   Height = (4.1 kg-m²/s²) / (19.6 kg-m/s²)

   =    0.209 meter high

and that's as far as we can go. None of this points us toward
calculating the length of the pendulum.

Answer: 0.857

Explanation:

(4.1^2)/(2*9.8)

A tiger runs one kilometer. The tiger does 15,000 J of work and has a total power output of 500 W. How many minutes does it take the tiger to run the distance? (Points : 3)0.30 sec
30 sec
3.0 sec
300 sec

Answers

Power is the amount of energy consumed per unit time. Having no direction, it is a scalar quantity. As is implied by the equation for power, a unit of power is equivalent to a unit of work divided by a unit of time. The formula would be as follows:

P = W/t

We calculate as follows:

500 W = 15000 J / t
t = 30 s

State the law of conservation of energy

Answers

Answer:

In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. ... For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodes.

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B. does not have a crankshaft.
C. has no ignition system.
D. does not utilize pistons.

Answers

The correct answer is (b.) does not have crankshaft. The main difference between the internal combustion engine and the diesel engine is that the diesel engine does not have a crankshaft. The crankshaft is for the conversion of the reciprocal into a circular motion.

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a. decreasing
b. increasing
c. unchanged

Answers

The average kinetic energy of the atoms that make up a substance which is changing from a liquid to a solid is decreasing. The answer is letter A. This is because there is more room for movement of atoms if the pahse is in liquid than in solid.

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