a 150n bird feeder is supported by three cables

Embry-Riddle Aeronautical University Department of Physical Sciences

Home Work # 4 & 5 PS 103 � Technical Physics�I

Due Date: Oct 3, 2014 (Friday)


Date: September 23, 2014 (Tuesday)

Semester: Fall-2014


Total point: 20


• Home work is due in the beginning of the class on the date mentioned above.

• Please note that providing answers without showing any working will not qualify as correct. So to get full points show EACH AND EVERY STEP.

• Please answer all questions neat and clean in as much detail as you can.

• All the conventions followed in the homework are same as that of lectures.

Question# 1:- You throw a ball vertically upward from the roof of a tall building. The ball leaves your hand at a point even with the roof railing with an upward speed of 15.0 m/s; the ball is then in free fall. On its way back down, it just misses the railing. Find

a) the ball’s position and velocity 1.00 s, 2.00 s, 3.00 s, and 4.00 s after leaving your hand;

b) the ball’s velocity when it is 5.00 m above the railing;

c) the maximum height reached;

d) the ball’s acceleration when it is at its maximum height.

e) At what time after being released has the ball fallen 5.00 m below the roof railing? and what will it’s speed be at that time?

f) At what time after being released has the ball fallen 2.00 m below the roof railing? and what will it’s speed be at that time?

Question# 2:- The boat in Figure 1 is heading due north as it crosses a wide river with a velocity of 10.0 km/h relative to the water. The river has a uniform velocity of 5.00 km/h due east. Determine the magnitude and direction of the boat’s velocity with respect to an observer on the riverbank.

Figure 1: Problem-2


Embry-Riddle Aeronautical University

Question# 3:- A batter hits a baseball so that it leaves the bat at speed v0 = 37.0 m/s at an angle ↵0 = 53.1�.

a) Find the position of the ball and its velocity (magnitude and direction) at t = 2.00 s.

b) Find the time when the ball reaches the high- est point of its flight, and its height h at this time.

c) Find the horizontal range R that is, the hor- izontal distance from the starting point to where the ball hits the ground. Figure 2: Problem-3

Question# 4:- Two tanks are engaged in a training exercise on level ground. The first tank fires a paint-filled training round with a muzzle speed of 250 m/s at 10.0� above the horizontal while advancing toward the second tank with a speed of 15.0 m/s relative to the ground. The second tank is retreating at 35.0 m/s relative to the ground, but is hit by the shell. You can ignore air resistance and assume the shell hits at the same height above ground from which it was fired. Find the distance between the tanks

a) when the round was first fired and

b) at the time of impact.

Question# 5:- Workmen are trying to free an SUV stuck in the mud. To extricate the vehicle, they use three horizontal ropes, producing the force vectors shown Figure 3.

a) Find the x� and y�components of each of the three pulls.

b) Use the components to find the magnitude and direction of the resultant of the three pulls. Figure 3: Problem-5

Question# 6:- Two horses are pulling a barge with mass 2.00⇥103 kg along a canal, as shown in Figure 4. The cable connected to the first horse makes an angle of ✓1 = 30.0� with respect to the direction of the canal, while the cable connected to the second horse makes an angle of ✓1 = 30.0�. Find the initial acceleration of the barge, starting at rest, if each horse exerts a force of magnitude 6.00 ⇥ 102 N on the barge. Ignore forces of resistance on the barge.

Figure 4: Problem-6

Question# 7:- Two dogs pull horizontally on ropes attached to a post; the angle between the ropes is 60.0�. If dog A exerts a force of 270 N and dog B exerts a force of 300 N, find the magnitude of the resultant force and the angle it makes with dog A’s rope.


Embry-Riddle Aeronautical University

Question# 8:- A 68.5-kg skater moving initially at 2.40 m/s on rough horizontal ice comes to rest uniformly in 3.52 s due to friction from the ice. What force does friction exert on the skater?

Question# 9:- You walk into an elevator, step onto a scale, and push the “up” button. You also recall that your normal weight is 625 N. Start answering each of the following questions by drawing a freebody diagram.

a) If the elevator has an acceleration of magnitude 2.50 m/s2, what does the scale read?

b) If you start holding a 3.85-kg package by a light vertical string, what will be the tension in this string once the elevator begins accelerating?

Question# 10:- A box rests on a frozen pond, which serves as a frictionless horizontal surface. If a fisherman applies a horizontal force with magnitude 48.0 N to the box and produces an acceleration of magnitude 3.00 m/s2, what is the mass of the box?

Question# 11:- Boxes A and B are in contact on a hor- izontal, frictionless surface, as shown in Figure 5. Box A has mass 20.0 kg and box B has mass 5.0 kg. A horizontal force of 100 N is exerted on box A. What is the magnitude of the force that box A exerts on box B? Figure 5: Problem-11

Question# 12:- Two objects of mass m1 and m2, with m2 > m1, are connected by a light, inextensible cord and hung over a frictionless pulley, as in Ac- tive Figure 6. Both cord and pulley have negligible mass. Find the magnitude of the acceleration of the system and the tension

Figure 6: Problem-12

Question# 13:- A 150-N bird feeder is supported by three cables as shown in Figure 7. Find the tension in each cable.

Figure 7: Problem-13

Question# 14:- An object with mass m1 = 5.00 kg rests on a frictionless horizontal table and is con- nected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2 = 10.0 kg, as shown in Figure 8. Find

a) the acceleration of each object and

b) the tension in the cable. Figure 8: Problem-14

Get Rewriting & Paraphrasing Help!

We have more than 1500 academic writers and we promise 0% plagiarism in your paper.

Paper's Detail

Category Business & Management
Paper Type Case Study Writing
Reference Type APA
Words 360

Our Online Writers

Mathematics & Physics

237 Homework Orders Completed



Study Table


Dear respected Client, I am a qualified and experienced Writer, Researcher, Tutor, analyst and Consultant. …

Mathematics & Physics

207 Homework Orders Completed



Helping Door


Dear respected Client, I am a qualified and experienced Writer, Researcher, Tutor, analyst and Consultant. …

Business & Management

237 Homework Orders Completed



Homework Specialist

United Kingdom

I am an admired writer in all fields of writing with over 5 years of …

Order Your Homework Today!

We have over 1500 academic writers ready and waiting to help you achieve academic success

Private and Confidential

Yours all information is private and confidential; it is not shared with any other party. So, no one will know that you have taken help for your Academic paper from us.

Our Customers Rating

Order Now

Frequently Asked Questions

Private and Confidential

Client’s all information is private and confidential; it is not shared with any other party. Even, we don’t ask client name and give user name to his/her profile. So, no one will know that you have taken help for your Academic paper from us.

Payment Safeguard

We only accept PayPal as our payment method. It is 100% secure. As, We don’t take and store any Credit/Debit card information.

Plagiarism Free

It is guaranteed all your Homework/Assignments Solutions are plagiarism free and original. Writers here charge for their efforts not for Copy/Paste work and TOS management takes strict action against those writers.

Guaranteed Quality

All the writers working here are recruited and chosen after taking strict evaluation of their Academic degrees, Experience and background. Then, they are allowed to work here as providing quality homework solution is our first priority.

24/7 online Writers

Our website is worldwide forum, where 100s of experts all over the world remain online round a clock, so, you can come at anytime and get the help from any of your homework. Even Urgent within 1 hour!

Prices at TutorsOnSpot.com

Prices at tutorsonspot.com are very competitive and low. As, tutorsonspot.com is marketplace so, all the writers bid for getting the work and competition among the writers lowers the price and you get your work done at low minimal prices.


  • Our service provides you with original content that does not have plagiarism in it. We are renowned for providing our customers with customized content that is written specifically for them. If you are thinking, can someone help me with my research paper? You can depend on us to help you out.
  • Our motto is to meet deadlines and deliver your solution right on time.We understand that you want to save your time and we respect it. Regardless of the difficulty, we deliver an unparalleled solution without any delay. Moreover, you get a money back guarantee in case you are not satisfied with our service. To understand this guarantee, check our terms and conditions related to it.
  • We perform a detailed research when writing your paper. With all of our services, we ensure to perform extensive research before creating your solution. Furthermore, if you have any questions, just reach out to our customer service team that is available all the day.
  • It is our primary goal to satisfy you. Thus, if you are thinking: can someone write my research paper? Just contact us and get the best services that you can get.

Best Service for the Struggling Students

Services For All Subjects

We have experienced tutors and assignment experts from all over the world for all subjects.

24/7 Live Writers

100's of qualified phd tutors round the clock.

Best Price Guarantee

Compare our price. Our services are of highest quality and lowest price, Guaranteed.

Plagiarism Free Work

Your information including personal details are safe with us.We have strict privacy policy.

Safe Payment Options

Pay using paypal though verified gateway for maximum safety, No risk.

100% Privacy Guaranteed

Scan our work with all plagiarism checking tools, Result will always be 0%.

Guarantee Your Academic Success!