Question

1. if a 2 kg object is thrown with a velocity of 10 m/s, what is the amount of kinetic energy? 20 j 100 j 200 j 1,000 j
2. which of the following statements is not true? rotational motion is the same thing as circular motion. an objects shape affects its rotational kinetic energy. increasing the mass of an object increases its rotational kinetic energy. the individual molecules of a substance have kinetic energy.
3. the acceleration of gravity near earths surface is ____ m/s. 2.42 6.93 9.81 12.34

match the statement to the force it describes. answers may be used more than once.

1. the force that holds the nucleus of an atom together
2. the weakest of the fundamental forces
3. difficult force to study since it is extremely short - ranged
4. can either attract or repel
5. causes most forces observed in daily life
6. the strongest of the fundamental forces
7. this force between two objects is directly proportional to the masses of the two objects
8. force responsible for chemical energy and elastic potential energy

a. electromagnetic force b. gravitational force c. strong nuclear force d. weak nuclear force

Explanation:

Step1: Recall kinetic - energy formula

The formula for kinetic energy is $K = \frac{1}{2}mv^{2}$, where $m$ is mass and $v$ is velocity.

Step2: Substitute given values

Given $m = 2\ kg$ and $v=10\ m/s$. Substitute into the formula: $K=\frac{1}{2}\times2\times(10)^{2}$.

Step3: Calculate

$K = \frac{1}{2}\times2\times100= 100\ J$.

Answer:

1. 100 J
2. Rotational motion is the same thing as circular motion.
3. 9.81
4. C. Strong nuclear force
5. D. Weak nuclear force
6. D. Weak nuclear force
7. A. Electromagnetic force
8. A. Electromagnetic force
9. C. Strong nuclear force
10. B. Gravitational force
11. A. Electromagnetic force