Q: How many picoseconds are in 2.56 years? Use $$1\ \text{year} = 365.25\ \text{days}$$ and $$1\ \text{ps} = 10$$^{-12}$$\ \text{s}.$$

$$1.35 \times 10$$^{19}$$\ \text{ps}$$

Q: You run 7 full laps around a $$400\ \text{m}$$ track in $$16\ \text{min}$$, stopping at your starting point. What are your average speed and the magnitude of your average velocity?

$$2.92\ \text{m/s},\ 0\ \text{m/s}$$

Q: A $$3.0\ \text{kg}$$ object is moving at $$4.0\ \text{m/s}. $$What is its momentum?

$$12\ \text{kg}\cdot\text{m/s}$$

Question 1

How many picoseconds are in 2.56 years? Use $$1\ 	ext{year} = 365.25\ 	ext{days}$$ and $$1\ 	ext{ps} = 10$$^{-12}$$\ 	ext{s}.$$

Accepted Answer

$$1.35 	imes 10$$^{19}$$\ 	ext{ps}$$

Question 2

How many significant figures are in the number $$0.00378260000$$?

Accepted Answer

8

Question 3

You run 7 full laps around a $$400\ 	ext{m}$$ track in $$16\ 	ext{min}$$, stopping at your starting point. What are your average speed and the magnitude of your average velocity?

Accepted Answer

$$2.92\ 	ext{m/s},\ 0\ 	ext{m/s}$$

Question 4

You are running at $$2.2\ 	ext{m/s}$$ and see an alligator $$32\ 	ext{m}$$ ahead. You stop $$5\ 	ext{m}$$ away from the alligator. What is your deceleration?

Accepted Answer

$$0.076\ 	ext{m/s}^2$$

Question 5

You throw a baseball straight up and catch it every $$1.5\ 	ext{s}$$, reaching a maximum height of $$2.76\ 	ext{m}. $$How fast are you throwing the ball?

Accepted Answer

$$7.4\ 	ext{m/s}$$

Question 6

Vector $$\vec{A} is$$ $$3.6\ 	ext{cm}$$ long and directed $$14^{\circ}$$ above the x-axis. Vector $$\vec{B}$$ has an x-component of $$-1.2\ 	ext{cm}$$ and a y-component of $$+2.4\ 	ext{cm}. $$What is the magnitude of $$\vec{C} if$$ $$\vec{C} = \vec{A} - 2\vec{B}$$?

Accepted Answer

$$7.1\ 	ext{cm}$$

Question 7

You throw a ball at $$10\ 	ext{m/s}$$, $$50^{\circ}$$ above the horizontal. It reaches a maximum height of $$0.66\ 	ext{m}. $$How long until you catch the ball?

Accepted Answer

$$1.6\ 	ext{s}$$

Question 8

When you are pushing a heavy cabinet across a rough floor and it is accelerating, which statement is correct?

Accepted Answer

The force you exert on the cabinet is equal to the force of the cabinet pushing back on you.

Question 9

A $$4.1\ 	ext{kg}$$ box is pulled with a $$5.2\ 	ext{N}$$ force at $$37^{\circ}$$ above the horizontal, accelerating at $$0.4\ 	ext{m/s}^2. $$What is the coefficient of kinetic friction?

Accepted Answer

$$0.07$$

Question 10

Which prefix corresponds to $$10^{-9}$$?

Accepted Answer

nano-

Question 11

A projectile is launched horizontally from a $$45\ 	ext{m}$$ high cliff. How long does it take to hit the ground? (Ignore air resistance, $$g = 9.8\ 	ext{m/s}^2)$$

Accepted Answer

$$3.03\ 	ext{s}$$

Question 12

A car accelerates from rest at $$2.5\ 	ext{m/s}^2$$ for $$8\ 	ext{s}. $$What is its final velocity?

Accepted Answer

$$20\ 	ext{m/s}$$

Question 13

A vector $$\vec{D}$$ has components $$D_x = 5\ 	ext{m}$$ and $$D_y = 12\ 	ext{m}. $$What is its magnitude?

Accepted Answer

$$13\ 	ext{m}$$

Question 14

A $$2.0\ 	ext{kg}$$ object is acted on by a net force of $$6.0\ 	ext{N}. $$What is its acceleration?

Accepted Answer

$$3.0\ 	ext{m/s}^2$$

Question 15

A ball is thrown upward with an initial velocity of $$5.0\ 	ext{m/s}. $$What is its maximum height above the throw point? ($$g = 9.8\ 	ext{m/s}^2)$$

Accepted Answer

$$1.28\ 	ext{m}$$

Question 16

A $$10\ 	ext{kg}$$ box is at rest on a horizontal surface. What is the normal force acting on it?

Accepted Answer

$$98\ 	ext{N}$$

Question 17

A car travels $$60\ 	ext{km}$$ east and then $$80\ 	ext{km}$$ north. What is the magnitude of its displacement?

Accepted Answer

$$100\ 	ext{km}$$

Question 18

A $$5.0\ 	ext{kg}$$ object is dropped from rest. How fast is it moving after $$3.0\ 	ext{s}$$? ($$g = 9.8\ 	ext{m/s}^2)$$

Accepted Answer

$$29.4\ 	ext{m/s}$$

Question 19

A $$3.0\ 	ext{kg}$$ object is moving at $$4.0\ 	ext{m/s}. $$What is its momentum?

Accepted Answer

$$12\ 	ext{kg}\cdot	ext{m/s}$$

Exam 1 - Study Guide D

Guida di studio - Domande di pratica

Study guide - Flashcard