Reference no: EM131390045
1. A 1,000-W motor powers a hoist used to lift cars at a service station.
(a) How much time would it take to raise a2,450-kg car2m?
(b) If the original motor is replaced with one rated at 3,000 W, how long would it take to complete this task?
2. A running back with a mass of 90 kg and a velocity of 9 m/s (toward the right) collides with, and is held by, a 135-kg defensive tackle going in the opposite direction (toward the left). What is the velocity of the tackle before the collision for their velocity afterward to be zero? (Remember, velocity is a vector)
3. It takes 110 minutes for a middle-aged physics professor to ride his bicycle up the road to Alpe d'Huez in France. The vertical height of the climb is 1,120 m, and the combined mass of the rider and bicycle is 86 kg. What is the bicyclist's average power output?
4. A bicycle and rider going 15 m/s approach a hill. Their total mass is 77 kg.
(a) What is their kinetic energy=8662.5 J
(b) If the rider coasts up the hill without pedaling, how high above its starting level will the bicycle be when it finally rolls to a stop?
|
Draw the probability density function
: For a uniform distribution over the interval a = 1 and b = 4, draw the probability density function and determine the median and the .1 and .9 quantiles.
|
|
Determine the median and the quantiles
: For the uniform distribution over the interval -3 to 2, determine (a) P(X ≤ 1), (b) P(X 0), (d) P(-1.2 ≤ X ≤ 1), (e) P(X = 1).
|
|
Two significant digits and include the appropriate units
: 1. You point a tennis-ball serving machine straight up and put a piece of plastic wrap across the top of the barrel, placing a 10-g marble on top of the barrel. When a 58-g tennis ball in the machine is fired, it sends the marble into the air. The..
|
|
Discuss the importance of determining value proposition
: Introduction to the functions of marketing, building on the influence of social, economic, ethical, legal, and technological forces on marketing activities, and marketing in a socially responsible way around the globe. Features real-world examples..
|
|
Bicyclist average power output
: It takes 110 minutes for a middle-aged physics professor to ride his bicycle up the road to Alpe d'Huez in France. The vertical height of the climb is 1,120 m, and the combined mass of the rider and bicycle is 86 kg. What is the bicyclist's averag..
|
|
Determine the probability of waiting exactly 12 seconds
: Suppose the waiting time at a traffic light has a uniform distribution from 0 to 20 seconds. Determine the probability of waiting exactly 12 seconds, less than 5 seconds, more than 10 seconds.
|
|
Calculate eva and mva for the most recent year
: Assume that there were 15 million shares outstanding at the end of the year, the year-end closing stock price was $65 per share, and the after-tax cost of capital was 8%. Calculate EVA and MVA for the most recent year
|
|
What is the change in entropy
: A 15.0-kg block of ice at 0.00 °C falls into Lake Superior, which is a freshwater lake. The lake water is at 10.0 °C, and the latent heat of fusion for ice is 3.34 × 105 J/kg. Find the various changes in entropy due to the melting of the ice.
|
|
Determine the minimum value of the load resistance
: A certain full-wave rectifier has a peak output voltage of 30 V. A 50 F capacitor-input filter is connected to the rectifier. Calculate the peak-to-peak ripple and the dc output voltage developed across a load resistance
|