Recent content by bulbasaur88

You are amazing. Thank you so much! my final is in two days! this helps so much :)

A sphere of density = 500 kg/m^3 floats on water (density of water = 1000 kg/m^3). 1. What fraction of the volume of the sphere is below the waterline? ---I understand this problem and I got the correct answer of 0.5 2. Another liquid of density 200 kg/m^3 is now added on top of the water. The...

A lawnmower engine with an efficiency of 0.22 rejects 9900 J of heat every second. What is the magnitude of the work that the engine does in one second? e = 0.22 Qc = 9900 J/s e = W/Qh Qh = Qc + W e = W / Qc + W 0.22 = W / 9900 + W 0.22(9900 + W) = W 2178 + 0.22W = W W = 2792.31...

If an area of 1 m2 at the Earth surface emits Q/t = 54E-3 J/s in radiation, what would the temperature at the Earth surface be, if there would be no other energy sources? Assume that the Earth is a perfect black body emitter (e = 1). Q/t = e(5.67E-8)(A)T4 54E-3 = 1(5.67E-8)T4 T = 31.2 K? The...

Imagine a diamond sphere radius of 1 cm traveling in space far from any heat sources. Embedded in the center of the sphere is a magic heater that can produce 0.3 W for an indefinite amount of time. If the emissivity of the surface is zero, what temperature does the sphere reach? Why? The...

A meat baster consists of a squeeze bulb attached to a plastic tube. When the bulb is squeezed and released, with the open end of the tube under the surface of the basting sauce, the sauce rises in the tube to a distance h, as the drawing shows. Using 1.013 × 1055Pa for the atmospheric pressure...

With Hf - Ho = 0 - 11.3 = -11.3 meters, I get 2.08 m/s. This answer is still wrong according to the WileyPlus electronic homework submission site.

----Unsolved----Work, Energy problem and friction EEEK I already posted this problem, but I cannot find it anymore! SO here it is again! A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has...

The tolerance allowed for this answer is +/- 2%. Does that mean I am just using the incorrect amount of significant figures ?

I wasted an attempt with 2.08 m/s. I have one try left please somebody help!

That equation should have a positive sign in front of it...but still I get the answer wrong because my original answer is still 20.9 m/s

I tried your answer. That is incorrect also...Eeek please help!

A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of 70 kg, and the height of the water slide is 11.3 m. If the kinetic frictional force does -7.6 × 103 J of work, how fast is the...

The moon has a diameter of 3.48 x 10^6 m and is a distance of 3.85 x 10^8m from the earth. The sun has a diameter of 1.39 x 10^9 m and is 1.50 x 10^11 m from the earth. (a.) What are the angles (in radians) subtended by the moon and the sun, as measured by a person standing on the earth...

A jet is circling an airport control tower at a distance of 18.0 km. An observer in the tower watches the jet cross in front of the moon. As seen from the tower, the moon substends an angle of 9.04 x 10-3 radians. Find the distance traveled (IN METERS) by the jet as the observer watches the nose...