### Help on Phyiscs Problem

in landing, the rotor of a helicopter slows from an angular speed of 4500 to rest in 5 seconds. how many revolutions does it travel during this time? .....

**Category**Physics

### A table of moments of inertia

A potter's wheel consists of a uniform concrete disk, 0.035 m thick and with a radius of 0.42 m. It has a mass of 48 kg. The wheel is rotating freely with an angular velocity of 9.6 rad/s when the potter stops it by pressing a wood block against the edge of the wheel, directing a force of 65 N on a line toward the center of the wheel. If the wheel stops in 7.2 seconds, what is the coefficient of friction between the block and the wheel? .....

**Category**Physics

### Physics question! HELP!

A barrel partially submerged in water. If the barrel and contacts have a mass of 10kg and the area A = 1/2 square meter, how far does the barrel sink (what is the magnitude of d?) .....

**Category**Physics

### Physics- Electricity and Magnitude

Earth has an excess of 60 electrons on each square centimeter of surface. Determine the electric charge in coulombs on each square centimeter of surface. Express your answer to two significant figures and include the appropriate units. q= VALUE UNITS .....

**Category**Physics

### A 0.150 kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.880 m/s .

A 0.150 kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.880 m/s . It has a head-on collision with a 0.294 kg glider that is moving to the left with a speed of 2.26 m/s . Suppose the collision is elastic. a)Find the magnitude of the final velocity of the 0.150 kg glider.(m/s). b)Find the magnitude of the final velocity of the 0.294 kg glider.(m/s). .....

**Category**Physics

### A block is placed on an elevator platform that moves downward with decreasing speed

A block is placed on an elevator platform that moves downward with decreasing speed ------------------------- ATTACHMENTS * __ 15032390_892573187510551_672894631_N.JPG [/download?f=169584&q=447801&csrf=592b8daa30a2d] .....

**Category**Physics

### AP Physics

A motorcycle daredevil wants to ride up a 50.0m ramp set at a 30.0Â° incline to the ground. It will launch him in the air and he wants to come down so he just misses the last of a number of 1.00m diameter barrels. If the speed at the instant when he leaves the ramp is 60.0m/s , how many barrels can be used? (CORRECT ANSWER D.) a. 79 b. 318 c. 332 d. 355 e. 402 I'm not sure how you get to the answer. I start by solving for time in the equaton: Yf = Yi + Viy + 1/2g(t)^2 Plugging in: 0 = 50sin30 + 60sin30 + 1/2(-9.8)(t)^2 I end up getting t = 3.35 and proceed to solve for x (the distance) x=x0+vi*cos30*t . Solving for x, I get 174.071 What am I doing wrong? .....

**Category**Physics

### Vectors analysis. asap

If d1+d2= 7.0d3 , d1-d2= 1.0d3 and d3=2.3i-hat+5.7j-hat , then what are (a) the x component of d1 , (b) the y component of d1 , (c) the x component of d2 , and (d) the y component of d2 ? .....

**Category**Physics

### Physics Questions

The file has been added as a pdf. I am having troubling answering the questions from 7 - 20 ------------------------- ATTACHMENTS * __ PHY-111 TOPIC 1 MULTIPLE-CHOICE PRACTICE TEST (1).PDF [/download?f=164787&q=445638&csrf=592b879b29f37] .....

**Category**Physics

### Applications of the Scientific Method

The scientific method is useful in problem solving and decision-making in a wide variety of fields. In this assignment, you will demonstrate how to use the scientific method to make decisions and solve problems in your field of study or everyday life. Identify a specific problem often faced in your field of study or everyday life. Research your problem and assess your data / research. Examples of such problems could be: Business Developing a new product that is superior to competitorâ€™s brands; or Establishing a price for a new product using the law of supply and demand; Information Systems and Technology The use of personal electronic devices for work purpose, or Determining in the most cost-effective computer for your business; Criminal Justice The reliability of eyewitness testimony, or Determining what evidence reveals to you about a crime; Everyday Life Selecting a particular brand of detergent, or Determining the most cost-efficient transportation / route.....

**Category**Physics