Recent content by enchanteuse

Good catch! That was a typo...I meant 4.2 * 10^3 J. Thanks LowlyPion:)

I figured it out:) a) (2140 cals *2400 J) / (24 days * 60 minutes * 60 seconds) b) (61 kg * 8848 m * 9.8 m/s) / (2140 cals *2400 J)

Homework Statement (a) If you follow a diet of 2140 food calories per day (2140 kilocalories), what is your average power consumption in watts? (A food or "large" calorie is a unit of energy equal to 4.2*10^3 J; a regular or "small" calorie is equal to 4.2 J.) Note for comparison that the...

Hmm well the answer supposedly isn't 0.32 J or -0.32 J. The way you answered it makes perfect sense though... I think you need to incorporate the 7 cm, but I'm not sure how.

Wouldn't it be -0.32 J since F = -k * delta x?

Homework Statement A spring has a relaxed length of 7 cm and a stiffness of 200 N/m. How much work must you do to change its length from 10 cm to 14 cm? Homework Equations Ef = Ei + W The Attempt at a Solution Ef = Ei + W Ef = Ei + F*delta x F*delta x = Ef - Ei F*delta x = (Ki + Ui)...

You forgot to divide (4500 kg)(7272.88 m/s)^2 by 2! It looks like we're working on the same homework questions:)

Homework Statement You will need to use the Momentum Principle to do the first part of this problem, and the Energy Principle to do the second part. A satellite of mass 6000 kg orbits the Earth in a circular orbit of radius of 7.4 106 m (this is above the Earth's atmosphere).The mass of...

Thank you! However, I would like to know the steps on how you got to the answer if possible...

Homework Statement The escape speed from a very small asteroid is only 32 m/s. If you throw a rock away from the asteroid at a speed of 44 m/s, what will be its final speed? Homework Equations Ki + Ui = 1/2mv^2 + (-GMm/R) = 0 (for v<<c) The Attempt at a Solution I am unsure of how to do...