Q: Convert $$-95000000000\ \mathrm{s}$$ into scientific notation.

$$-9.5 \times 10$$^{10}$$\ \mathrm{s}$$

Question 1

Which of the following best describes the steps of the scientific method?

Accepted Answer

Observation, hypothesis, experiment, analysis, conclusion

Question 2

Which of the following is a requirement for a scientific hypothesis?

Accepted Answer

It must be testable and falsifiable

Question 3

A ball is thrown horizontally with an initial velocity of $$+16\ \mathrm{m/s}$$ from a height of $$3\ \mathrm{m}$$ above the ground. What is the initial velocity in the $$y$$ direction?

Accepted Answer

$$0\ \mathrm{m/s}$$

Question 4

A car traveling at $$5.2\ \mathrm{m/s}$$ applies the brakes to come to a complete stop in $$1.8\ \mathrm{s}$$ with constant acceleration. What is the acceleration of the car?

Accepted Answer

$$-2.89\ \mathrm{m/s^2$}$$

Question 5

A projectile is fired horizontally with velocity $$23\ \mathrm{m/s}$$ off of a $$50\ \mathrm{m}$$ tall building. How long does it take to hit the ground? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$3.19\ \mathrm{s}$$

Question 6

A pineapple at rest is dropped off a cliff. At what elapsed time is the pineapple’s speed $$35\ \mathrm{m/s}$$? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$3.57\ \mathrm{s}$$

Question 7

What is the net force acting on a pencil of mass $$0.1\ \mathrm{kg}$$ falling downward at constant velocity of $$3\ \mathrm{m/s}$$?

Accepted Answer

$$0\ \mathrm{N}$$

Question 8

Convert $$-95000000000\ \mathrm{s}$$ into scientific notation.

Accepted Answer

$$-9.5 	imes 10$$^{10}$$\ \mathrm{s}$$

Question 9

If an object is displaying curved motion, what can we infer about the object in terms of Newton’s first law and kinematics?

Accepted Answer

A net force is acting on the object, causing its velocity to change direction

Question 10

If an object is slowing down, what does that tell us about the velocity and acceleration of the object?

Accepted Answer

The velocity and acceleration are in opposite directions

Question 11

What is the difference between speed and velocity?

Accepted Answer

Speed is a scalar, velocity is a vector

Question 12

If an object has zero acceleration, what does that tell you about the velocity?

Accepted Answer

The velocity is constant

Question 13

Why does a parachute increase the chances of survival when jumping from a plane?

Accepted Answer

It increases air resistance, reducing the terminal velocity

Question 14

What is the average net force required to bring a $$3500\ \mathrm{kg}$$ truck up to a speed of $$15\ \mathrm{m/s}$$ from rest in a time of $$30\ \mathrm{s} at $$constant acceleration?

Accepted Answer

$$1750\ \mathrm{N}$$

Question 15

If a $$5\ \mathrm{N}$$ net force acting on an object results in an acceleration of $$3.2\ \mathrm{m/s^2$}$$, what is the mass of the object?

Accepted Answer

$$1.56\ \mathrm{kg}$$

Question 16

A $$3\ \mathrm{kg}$$ object is pushed along a rough horizontal surface with a force of $$9\ \mathrm{N} to $$the right. What is the acceleration of the object if the coefficient of kinetic friction is $$\mu_k = 0.20$$? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.36\ \mathrm{m/s^2$}$$

Question 17

Two physics students are sitting on rolling carts facing each other. Student 1 ($$m_1 = 120$$\ \mathrm{kg}$$) pushes student 2 (m_2$ = 100\ \mathrm{kg}) $$away with a horizontal $$6.85\ \mathrm{N}$$ force. What is the acceleration of student 2?

Accepted Answer

$$0.0571\ \mathrm{m/s^2$}$$

Question 18

Refer to the image of three train cars (masses $$3\ \mathrm{kg}$$, $$5\ \mathrm{kg}$$, $$2\ \mathrm{kg}) $$being pulled by a $$10\ \mathrm{N}$$ force on a frictionless track. What is the acceleration of the entire system?

Accepted Answer

$$1.25\ \mathrm{m/s^2$}$$

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