Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Physics Expert

Finding work, energy, power, impulse and momentum of particles.

1. A worker pushes a wheelbarrow with the force of 40N over a level distance of 6m. If a frictional force of 24N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow?
a. 240 J
b. 216 J
c. 144 J
d. 96 J
e. 75 J

2. A satellite is held in orbit by a 2N gravitational force. Each time the satellite completes an orbit of circumference 80 000 km, the work done on it by gravity is:
a. 1.6 108 J.
b. 1.6 1011 J.
c. 6.4 1011 J.
d. 0.
e. None of the above.

3. Which of the following is an ex of a non conservative force?
a. gravity
b. magnetism
c. friction
d. Both choices A and B are valid.
e. Both choices A and C are valid.

4. A horizontal force of 200N is applied to a 55 kg cart across a 10 m level surface. If the cart accelerates at 2.0 m/s2, then what is the work completed by the force of friction as it acts to retard the motion of the cart?
a. -1 100 J
b. -900 J
c. -800 J
d. -700 J
e. -600 J

5. An amount of work equal to 1.50 J is necessary to compress the spring in a spring-gun. What is the "launch speed" of a 15 g marble?
a. 14 m/s
b. 15 m/s
c. 18 m/s
d. 21 m/s
e. 23 m/s

6. A 20 N crate starting at rest slides down a rough 5 m long ramp, inclined at 25 with the horizontal. 20 J of energy is lost to friction. What would be the speed of the crate at the bottom of the incline?
a. 0.98 m/s
b. 1.9 m/s
c. 3.2 m/s
d. 4.7 m/s
e. 5.6 m/s

7. A 0.12 kg ball is moving at 6m/s while it is hit by a bat, causing it to reverse direction and have a speed of 14m/s. What is the change in the magnitude of the momentum of the ball?
a. 0.39 kgm/s
b. 0.42 kgm/s
c. 1.3 kgm/s
d. 2.4 kgm/s
e. 3.2 kgm/s

8. Lonnie pitches a baseball of mass 0.20kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60m/s. If the bat is in contact with the ball for 0.05 s, what is the impulse experienced by ball?
a. 360 Ns
b. 20 Ns
c. 400 Ns
d. 9.0 Ns
e. 35 Ns

9. A grindstone spinning at the rate of 8.3 rev/s has what approximate angular speed?
a. 3.2 rad/s
b. 26 rad/s
c. 52 rad/s
d. 81 rad/s
e. 97 rad/s

10. A 0.30 m-radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 2.0 rad/s2 over a 5.0-s interval?
a. 12.5 rad
b. 25 rad
c. 2.0 rad
d. 0.50 rad
e. 0.25 rad

Physics, Academics

  • Category:- Physics
  • Reference No.:- M917993

Have any Question? 


Related Questions in Physics

A state-of-the-art npn si transistor has a signal

A state-of-the-art n/p/n Si transistor has a signal amplifying or electrically active p-type base layer whose volume is 1μm 3  and which is doped with 10 18  boron/cm 3 . Suppose that the transistor will not work due to ...

Explain how flight is achieved nbspplease provide an

Explain how flight is achieved.  Please provide an example and use  three concepts or laws to support  your explanation and example.

Calculate the net force on yournbsp05-cm2nbspeardrum that

Calculate the net force on your 0.5-cm2 eardrum that air exerts on the inside and the outside after you drive from Denver, Colorado (elevation 1609 m) to the top of Pikes Peak (elevation 4301 m). Assume that the air pres ...

The distance s a car has traveled on a trip is shown in the

The distance, s, a car has traveled on a trip is shown in the table as a function of the time, t, since the trip started. Find the average velocity between t = 2 and t = 5.

From the top of a cliff a person throws a stone straight

From the top of a cliff, a person throws a stone straight downward. The initial speed of the stone just after leaving the person's hand is 8.9 m/s. (a) What is the acceleration (magnitude and direction) of the stone whil ...

The indium acceptor in si et-ev-270mv was used as 4-micron

The indium acceptor in Si, (E T -E v )-270mV, was used as 4-micron infrared detector in satellite and space-craft applications since there is a atmospheric absorption window around this wavelength. The absorption cross s ...

The air freshener shown in the figure below is used to

The air freshener shown in the figure below is used to deliver a pleasant vanilla fragrance in a room. The device consists of a rod 1 cm in diameter and 5 cm in length. The rod is composed of a solid mixture containing a ...

The purpose of this problem is to show in three ways that

The purpose of this problem is to show in three ways that the binding energy of the electron in a hydrogen atom is negligible compared with the masses of the proton and electron. (a) Calculate the mass equivalent in u of ...

1 for a crystal of finite size it is found that there are

1. For a crystal of finite size it Is found that there are 100 allowed electron energy levels at the energy E 1  in the conduction band and that the Fermi energy lies at E 1 , i.e. E F -E 1 . How many electrons are there ...

Several thin sheets of naphthalene 025 cm thick and 10 cm

Several thin sheets of naphthalene, 0.25 cm thick and 10 cm square, are arranged parallel to each other with their centers at 1-cm intervals. Air at 273 K and 1:013 × 10 5  Pa enters this sandwich arrangement with a bulk ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen