Question

A very tall crane of height h has a pulley and a light on top. The...

  1. A very tall crane of height h has a pulley and a light on top. The pulley is raising a girder of length L feet. The shadow is growing at a rate of 1/5 L feet per second when the length of the shadow of the girder is 2L feet.

    (a) How high is the girder at this instant?
    (b) How fast is the girder rising at this instant?

Math   Calculus   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A street light is at the top of a 10 ft tall pole. A woman 6...
A street light is at the top of a 10 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 8 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 40 ft from the base of the pole?
1. A street light is mounted on top of a 6-meter-tall pole.A man 2 m tall...
1. A street light is mounted on top of a 6-meter-tall pole.A man 2 m tall walks away from the pole with a speed of 1.5 m/s along a straight path.How fast is the tip of his shadow moving when he is 10 m from the pole ? 2. A cone-shaped paper drink is made to be made to hold 27 cm^3 of water. Find the height and radius of the cup that will use the smallest amount of paper....
The top of a 5-foot ladder is sliding down a wall at a rate of 7...
The top of a 5-foot ladder is sliding down a wall at a rate of 7 feet per second. How fast is the base of the ladder sliding away from the wall at the instant when the top of the ladder is 3 feet from the ground?
The top of a 50-foot ladder is sliding down a wall at a rate of 15...
The top of a 50-foot ladder is sliding down a wall at a rate of 15 feet per second. How fast is the base of the ladder sliding away from the wall at the instant when the top of the ladder is 30 feet from the ground? HINT [See Example 2.]
A water trough is 9 feet long, and its cross section is an equilateral triangle with...
A water trough is 9 feet long, and its cross section is an equilateral triangle with sides 4 feet long. Water is pumped into the trough at a rate of 2 cubic feet per second. How fast is the water level rising when the depth of the water is 1/2 foot? ( Hint: First, what is the height h of an equilateral triangle of side length s? Next, what is the area of an equilateral triangle in terms of the...
Activity 2: Applications of the Derivatives To make a phrase/words, solve the 18 application of derivatives...
Activity 2: Applications of the Derivatives To make a phrase/words, solve the 18 application of derivatives below. Then replace each numbered blank with the letter corresponding to the answer for that problem. Show all solutions on the answers given below. "__ __ __    __ __ __ __ __ __ ,    __ __ __    __ __    __ __ __ __ ."                                                                                                                                  1-2. A certain calculus student hit Mr. Pleacher in the head with a snowball. If the snowball is melting...
please only answer if you can do all parts, I also included my answer but they...
please only answer if you can do all parts, I also included my answer but they are wrong please do not leave the same one part 4) A spherical balloon is inflated so that its volume is increasing at the rate of 3.8 ft3/minft3/min. How rapidly is the diameter of the balloon increasing when the diameter is 1.8 feet? The diameter is increasing at 1.8 (My answer but its incorrect) ft/min. part 5) A street light is at the top...
please don't do this unless you can do all parts, circle answer and show work please...
please don't do this unless you can do all parts, circle answer and show work please part 1) Assume x and y are functions of t. Evaluate dy/dt  given that y^2−8x^3=225 dx/dt=5, x=−3, y=3 Answer: dy/dt= part 2) Assume x and y are functions of t. Evaluate dy/dt given that 5xy+ sqrt(2x+y)=48 dx/dt=-4; x=3 ,y=3. Answer: dy/dt= part 3) Suppose that for a company manufacturing calculators, the cost, and revenue equations are given by C=70000+40x, R=400−x^2/30,, where the production output in...
1.A conical tank has height 3 m and radius 2 m at the top. Water flows...
1.A conical tank has height 3 m and radius 2 m at the top. Water flows in at a rate of 1.5 m3/min. How fast is the water level rising when it is 1.1 m from the bottom of the tank? (Round your answer to three decimal places.) 2.At a given moment, a plane passes directly above a radar station at an altitude of 6 km. The plane's speed is 900 km/h. How fast is the distance between the plane...
For full credit be sure to show all work and units. 1. A 20 foot ladder...
For full credit be sure to show all work and units. 1. A 20 foot ladder leans against a vertical wall. The bottom of the ladder slides away from the wall at 2 ft/sec. a. How fast is the top of the ladder sliding down the wall when the top of the ladder is 12 feet from the ground? b. Interpret the meaning of the sign. 2. The current speed record for weight loss is 487 pounds to 130 pounds...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT