Part A A cannon tilted up at a 29.0 ° angle fires a cannon ball at 68.0 m/s from atop a 10.0 m-high fortress wall. What is the ball's impact speed on the ground below?

Astronomers using a 2.0-m-diameter telescope observe a distant supernova-an exploding star. The telescope's detector records 7.5 x 10-¹1 J of light energy during the first 10 s. It's known that this type of supernova has a visible-light power output of 5.5 x 10³7 W for the first 10 s of the explosion. Part A How distant is the supernova? Give your answer in light years, where one light year is the distance light travels in one year. The speed of light is 3.0 x 108 m/s. Express your answer in light years. ► View Available Hint(s) VE ΑΣΦ xa Xb b d=2.86 108 √x x x Submit Previous Answers < Return to Assignment x Provide Feedback IXI ? X.10n X Incorrect; Try Again; 5 attempts remaining It seems that you have used the telescope's diameter instead of its radius in your calculations. You may need to review Area Calculations for a Circle. ly

I need help with this physics question. It relates to work/kinetic/potential energy. Approximations for average weight of a human can be used.

A 55 kg snowboarder begins his run at the top of a 50.0 m tall hill with a speed of 0.5 m/s. What is the speed of the snowboarder at the bottom of the hill?

Astronomers using a 2.0-m-diameter telescope observe a distant supernova-an exploding star. The telescope's detector records 7.5 x 10-11 J of light energy during the first 10 s. It's known that this type of supernova has a visible-light power output of 5.5 x 1037 W for the first 10 s of the explosion. Part A How distant is the supernova? Give your answer in light years, where one light year is the distance light travels in one year. The speed of light is 3.0 x 108 m/s. Express your answer in light years. ► View Available Hint(s) d= IVE ΑΣΦ Submit ? ly

1. A ball rolls off a table. +X X = 0 a. How long does it take to fall 0.80 meters to the floor? Show all of your work. b. How far does it travel horizontally while it's falling? Its initial horizontal velocity is 2.5 meters / second. Show all of your work. 2.5 m/s 0.80 m

A certain sprìng whose normal length is 42 cm is stretched 6.3 cm by a force of 18 N. How much work is done in stretching the spring from its normal length to a length of 44.7 cm? work= Number N. m Round your answer to 4 decimal places

A spring with k= 360 N/m is compressed x = 11cm by a 1.85 kg block on a horizontal table with coefficient of friction of 0.38. This means there is friction everywhere on the table! A. What is the speed of the block when it is released? B. Determine the distance the block travels before it comes to rest.

A block of mass 2.28 kg starts sliding from rest down an incline plane for 25 cm. If the block has a velocity of 1.14 m/s, and the incline has an angle measured from the +x axis of 37 degrees then: a. How much work did kinetic friction do on the block? b. What is the coefficient of kinetic friction between the block and the incline?

A 1400-kg elevator is lifted at a constant speed of 1.5 m/s through a height of 25 m. Part A How much work is done by the tension in the elevator cable? Express your answer to two significant figures and include appropriate units. ? Value Units Submit Request Answer Part B How much work is done by gravity? Express your answer to two significant figures and include appropriate units. HẢ ? Value Units