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 ...

A heavy string is tied at one end to a movable support and

A heavy string is tied at one end to a movable support and to a light thread at the other end as shown in figure (15-E12). The thread goes over a fixed pulley and supports a weight to produce a tension. The lowest freque ...

Derive the ideal soliton distribution at the first

Derive the ideal soliton distribution. At the first iteration (t = 0) let the number of packets of degree d be h 0 (d); show that (for d > 1) the expected number of packets of degree d that have their degree reduced to d ...

1 a circular coin of diameter a is thrown onto a square

1. A circular coin of diameter a is thrown onto a square grid whose squares are b × b. a. Buffon's needle. A needle of length a is thrown onto a plane covered with equally spaced parallel lines with separation b. What is ...

You walk for 644 km with at a constant velocity of 255 ms

You walk for 6.44 km with at a constant velocity of 2.55 m/s due west, turn around, and then walk with an average velocity of 0.465 m/s due east. From your starting point to your destination, your overall average velocit ...

If we have two different elements and each has an electron

If we have two different elements, and each has an electron drop from the first excited state to the ground state, they will both have emission lines. But these lines may be very different between the two elements. Expla ...

Suppose your bathroom scale reads your mass as 85 kg with

Suppose your bathroom scale reads your mass as 85 kg, with an 8% uncertainty. What is the uncertainty in your mass? (Note that uncertainties should be reported to one significant figure.)

An 1800 kg car stopped at a traffic light is struck from

An 1800 kg car stopped at a traffic light is struck from the real by a 900kg car. The two cars become entangled, moving along the same paths that of the originally moving car. If the smallest car were moving at 20m/s bef ...

Question 1a in no more than 200 words briefly explain both

Question 1 (a) In no more than 200 words, briefly explain both the similarities and differences between Newton's law of universal gravitation and Coulomb's law. (b) Consider two point-like objects, A and B, the first of ...

Diodes and transistors are no longer useful when the

Diodes and transistors are no longer useful when the temperature is so high that the p/n junction built-in potential barrier height is less than about 4kT. Calculate the temperature for an Si p+/n abrupt junction diode w ...

  • 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