Recent content by Ripcurl

Homework Statement A tennis ball with a velocity of 7.97 m/s to the right is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a velocity of −5.07 m/s to the left. If the ball is in contact with the wall for 0.011 s, what is the average...

But it is. Wow. You're amazing! Thanks! XD

So you're saying find the volume. I got 623.6145193 cm^3. Then I multiply that by the density (8.15) to get the mass. I get 5082.458333. That doesn't seem right. XD

Homework Statement A sphere of metal has a radius of 5.3 cm and a density of 8.15 g/cm3. What is the mass of the sphere? Answer in units of g.Homework Equations Density=mass/volume Volume of a sphere=4/3лr^3The Attempt at a Solution I found the volume by multiplying 4/3 by л and 5.3 squared. I...

Ha ha, I kinda did a double take when I saw that too, but I knew what you meant, obviously. :wink: But I got the question right! Thanks again for the help! o:)

sin=opposite/hyp. cos=adjacent/hyp tan=opposite/adjacent

Soh cah toa

I understand that. XD That's why I asked. I wasn't expecting anyone to do anything for me. :3 Anyway, hmm, what formula? I can't say that I know. I mean, I'm thinking it has something to do with sin, but I'm not entirely sure.

Alright, I got it! Thank you very much!

Oh, wait, I see what you're saying. Hold on, I'll try it. One sec. :3

Okay, I drew a picture and I have a graph with a circle. I have the radius as 10.38700149 and I drew an arc (representing the angle) from the the positive x-axis counterclockwise to the radius in the third quadrant.

Homework Statement A person travels by car from one city to another with different constant speeds between a pair of cities. She drives for 30.3 min at 85.2 km/h, 14.4 min at 91.1 km/h, and 48.9 min at 43.1 km/h, and spends 19.1 min eating lunch and buying gas. The distance between the initial...

Here is my problem: The cartesian coordinates of a point in the xy plane are x = −8.83 m, y = −5.47 m. The distance between the point and the origin is 10.38700149. Calculate the angle  between the radius-vector of the point and the positive x-axis (measured counterclockwise from the...

I have this exact same problem with different numbers! (UT homework maybe? XD) I'm pretty stuck.

Homework Statement If the rotation of a planet of radius 5.99x10^6 m and free-fall acceleration 7.87 m/s^2 increased to the point that the centripetal acceleration was equal to the gravitational acceleration at the equator, what would be the tangential speed of a person standing at the...