Q: Which of the following statements about the acceleration due to gravity is correct?

It is always $$9.8\ \text{m/s}^2$$ downward near Earth's surface.

Question 1

A car accelerates from rest at a constant rate of $$2.0\ 	ext{m/s}^2$$ for $$5.0\ 	ext{s}. $$What is the total distance traveled by the car during this time?

Accepted Answer

$$50\ 	ext{m}$$

Question 2

Which of the following statements about the acceleration due to gravity is correct?

Accepted Answer

It is always $$9.8\ 	ext{m/s}^2$$ downward near Earth's surface.

Question 3

A student throws a ball horizontally from a $$2.0\ 	ext{m}$$ high balcony with a speed of $$8.0\ 	ext{m/s}. $$How long does it take for the ball to hit the ground?

Accepted Answer

$$0.64\ 	ext{s}$$

Question 4

Which of the following is NOT a vector quantity?

Accepted Answer

Time

Question 5

A $$5.0\ 	ext{kg}$$ object is acted upon by a net force of $$20\ 	ext{N}. $$What is its acceleration?

Accepted Answer

$$4.0\ 	ext{m/s}^2$$

Question 6

A $$2.0\ 	ext{kg}$$ block slides across a horizontal surface with a coefficient of kinetic friction $$\mu_k = 0.3. If $$the normal force is $$19.6\ 	ext{N}$$, what is the magnitude of the frictional force?

Accepted Answer

$$5.88\ 	ext{N}$$

Question 7

A $$0.50\ 	ext{kg}$$ ball is dropped from a height of $$10\ 	ext{m}. $$What is its velocity just before hitting the ground? (Ignore air resistance.)

Accepted Answer

$$14\ 	ext{m/s}$$

Question 8

A $$3.0\ 	ext{kg}$$ object moving at $$4.0\ 	ext{m/s}$$ collides with a stationary $$2.0\ 	ext{kg}$$ object. If the collision is perfectly elastic, what is the velocity of the $$2.0\ 	ext{kg}$$ object after the collision?

Accepted Answer

$$4.8\ 	ext{m/s}$$

Question 9

A $$1.0\ 	ext{kg}$$ mass is attached to a spring with spring constant $$k = 200\ 	ext{N/m}. $$What is the potential energy stored in the spring when it is compressed by $$0.10\ 	ext{m}$$?

Accepted Answer

$$1.0\ 	ext{J}$$

Question 10

A cyclist travels $$3.0\ 	ext{km}$$ north and then $$4.0\ 	ext{km}$$ east. What is the magnitude of the displacement?

Accepted Answer

$$5.0\ 	ext{km}$$

Question 11

A $$2.0\ 	ext{kg}$$ object is moving at $$5.0\ 	ext{m/s}. $$What is its kinetic energy?

Accepted Answer

$$50\ 	ext{J}$$

Question 12

A $$10\ 	ext{kg}$$ box is pushed $$5.0\ 	ext{m}$$ across a floor by a force of $$20\ 	ext{N}$$ parallel to the displacement. How much work is done?

Accepted Answer

$$100\ 	ext{J}$$

Question 13

A satellite orbits Earth at a radius of $$7.0 	imes 10^6$\ 	ext{m}. $$What is the acceleration due to gravity at this altitude? (Use $$G = 6.67 	imes 10$$^{-11}$$\ 	ext{Nm}^2/	ext{kg}^2$$, $$m_E = 5.98 	imes 10$$^{24}$$\ 	ext{kg})$$

Accepted Answer

$$8.1\ 	ext{m/s}^2$$

Question 14

A $$0.2\ 	ext{kg}$$ ball is thrown vertically upward with an initial speed of $$10\ 	ext{m/s}. $$What is the maximum height reached?

Accepted Answer

$$5.1\ 	ext{m}$$

Question 15

A $$1.0\ 	ext{kg}$$ object moves in a circle of radius $$2.0\ 	ext{m} at a $$speed of $$3.0\ 	ext{m/s}. $$What is the centripetal acceleration?

Accepted Answer

$$4.5\ 	ext{m/s}^2$$

Question 16

A $$2.0\ 	ext{kg}$$ object is moving at $$6.0\ 	ext{m/s}$$ and collides with a $$3.0\ 	ext{kg}$$ object at rest. If the collision is perfectly inelastic, what is the final velocity of the combined mass?

Accepted Answer

$$2.4\ 	ext{m/s}$$

Question 17

A $$1.0\ 	ext{kg}$$ object is moving at $$2.0\ 	ext{m/s}$$ and collides elastically with a $$1.0\ 	ext{kg}$$ object at rest. What is the velocity of the first object after the collision?

Accepted Answer

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

Question 18

A $$0.5\ 	ext{kg}$$ ball is thrown at $$20\ 	ext{m/s} at an $$angle of $$30^{\circ}$$ above the horizontal. What is the horizontal component of its velocity?

Accepted Answer

$$17.3\ 	ext{m/s}$$

Question 19

A $$2.0\ 	ext{kg}$$ object is moving at $$3.0\ 	ext{m/s}$$ and experiences a force of $$6.0\ 	ext{N}$$ for $$2.0\ 	ext{s}. $$What is its final velocity?

Accepted Answer

$$9.0\ 	ext{m/s}$$

Exam 1 - Study Guide C

Guida di studio - Domande di pratica

Study guide - Flashcard