Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Physics Expert

1. A 20 N horizontal force is applied to a 4.0 kg box. The box moves a horizontal distance of 3.0 meters. The work done by the 20 N forces is...?

1. 60 J

2. 80 J

3. 100 J

4. 120 J

5. 140 J

2. A roller coaster is towed up an incline at a stable speed of 0.50m/s by a chain parallel to the surface of the incline. The slope is 3.0 percent, which means that the elevation increases by 3 m for every 100 m of distance along the surface. The mass of the roller coaster is 400 kg. Neglect friction, what is the magnitude of the force exerted on the roller coaster through the chain?

1. 510 N

2. 205 N

3. 120 N

4. 335 N

5. 80 N

3. A runner runs three-quarters of the way around a circular track, of radius 60.0 m, while she collides with another runner and trips. (a) How far had the runner travelled on the track before the collision? (b) What was the magnitude of the displacement of the runner from her starting position while accident occurred?

(a) 265 m (b) 93.4 m

(a) 278 m (b) 86.8 m

(a) 292 m (b) 78.6 m

(a) 283 m (b) 84.9 m

4. An arrow is shot into the air at an angle of 60.0° above the horizontal with the speed of 20.0 m/s. (a) what are the x- and y-components of the velocity of the arrow 3 s after it leaves the bowstring? (b) What is the displacement of the arrow in the y-direction throughout the 3.0-s interval?

(a) 10.0 m/s and -12 m/s (b) 8 m

(a) 12.0 m/s and -10 m/s (b) 8 m

(a) 10.0 m/s and -12 m/s (b) 6 m

(a) 12.0 m/s and -10 m/s (b) 6 m

5. Switch these to radian measure: (a) 30.0°, (b) 135°, (c) 1/4 revolutions.

(a) 0.501 rad; (b) 2.36 rad; (c) or 1.05 rad

(a) 0.524 rad; (b) 2.27 rad; (c) or 1.57 rad

(a) 0.524 rad; (b) 2.36 rad; (c) or 1.57 rad

(a) 0.501 rad; (b) 2.27 rad; (c) or 1.05 rad

(a) 0.524 rad; (b) 2.36 rad; (c) or 1.05 rad

6. A highway curve has a radius of 122 m. At what angle must the road be banked so that a car travelling at 26.8 m/s (60 mph) has no tendency to skid sideways on road? [Hint: No tendency to skid means the frictional force is zero.]

1. 25°

2. 22°

3. 31°

4. 38°

7. A small body of mass 0.5kg is attached by a 0.50m long cord to a pin set into the surface of a frictionless table top. The body moves in a circle on the horizontal surface with the speed of 2.0π m/s. (a) what is the magnitude of the centripetal acceleration of the body? (b) What is the tension in the cord?

(a) 79 m/s2 ; (b) 37 N

(a) 79 m/s2 ; (b) 39 N

(a) 65 m/s2 ; (b) 33 N

(a) 65 m/s2 ; (b) 37 N

(a) 79 m/s2 ; (b) 33 N

8. The tension in the horizontal (? =0) towrope pulling a water-skier is 240 N while the skier moves due west a distance of 54m. How much work does towrope do on the water-skier?

1. 10 kJ

2. 4.4 kJ

3. 18 kJ

4. 13 kJ

9. A roller coaster car (mass = 988 kg including passengers) is about to roll down a track (the figure below). The diameter of the circular loop is 20m and the car starts out from rest 40m above the lowest point of the track. Overlook friction and air resistance and assume g = 9.81 m/s2. (a) At what speed does the car reach the top of loop?

(a) 11.4 m/s

(a) 21.6 m/s

(a) 12.9 m/s

(a) 9.9 m/s

(a) 19.8 m/s

10. A sports car travelling along a straight line increases its velocity from 20.0 mi/h to 60.0 mi/h. What is the ratio of the final to the initial magnitude of its momentum?

1. 3.00

2. 6.00

3. 4.00

4. 2.00

5. 5.00

Physics, Academics

  • Category:- Physics
  • Reference No.:- M917213

Have any Question? 


Related Questions in Physics

1 show that this modified lempel-ziv code is still not

1. Show that this modified Lempel-Ziv code is still not ‘complete', that is, there are binary strings that are not encodings of any string. 2. Give examples of simple sources that have low entropy but would not be compre ...

In a time of t seconds a particle moves a distance of s

In a time of t seconds, a particle moves a distance of s meters from its starting point, where s = 4t 3 . (a) Find the average velocity between t = 0 and t = h if: (i) h = 0.1, (ii) h = 0.01, (iii) h = 0.001. (b) Use you ...

Suppose your bathroom scale reads your mass as 82 kg with

Suppose your bathroom scale reads your mass as 82 kg, with an 8% uncertainty. What is the uncertainty in your mass? (Note that uncertainties should be reported to one significant figure.)

1 using the expression for the gradient in polar

1. Using the expression for the gradient in polar coordinates (Appendix A), find the gradient of ψ(r,θ) when Where is the gradient maximum? The terms A and a are constant. 2. Given the following expression for the pressu ...

What do you think are the two most important functions of

What do you think are the two most important functions of the family? Give at least one example for each function to demonstrate why you think it is important to a person's overall life outcomes. Explain whether you thin ...

With t in years the population of a herd of deer is

With t in years, the population of a herd of deer is represented by (a) How does this population vary with time? Graph P(t) for one year. (b) When in the year the population is a maximum? What is that maximum? Is there a ...

While shopping for clothes a black woman is followed around

While shopping for clothes, a black woman is followed around the store by a white sales associate. Frustrated, she leaves the store and decides to go home. Her husband, on seeing her enter the house, asks: "What's for di ...

Air passes through a naphthalene tube that has an inside

Air passes through a naphthalene tube, that has an inside diameter of 2.5 cm, flowing at a bulk velocity of 15 m/s. The air is at 283 K and an average pressure of 1:013 × 10 5  Pa. Assuming that the change in pressure al ...

If k ge 1 the graphs of y sin x and y ke-x intersect for

If k ≥ 1, the graphs of y = sin x and y = ke -x intersect for x ≥ 0. Find the smallest value of k for which the graphs are tangent. What are the coordinates of the point of tangency?

For a particular car windscreen wiper mechanism an electric

For a particular car windscreen wiper mechanism, an electric motor is required that can provide 5 N m of torque at about 35 rpm. A small permanent magnet d.c. motor is suggested as being suitable for this purpose. The ma ...

  • 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