Recent content by queenspublic

Hello?

Homework Statement

Homework Statement 9.0 = 34.2(1 - e-t/2.7) Solve for t 2. The attempt at a solution .263158 = (1 - e-t/2.7) What is e?

Homework Statement Homework Equations The Attempt at a Solution First time: I got -1.468e-19 which is wrong. Second time: I got -6.407e-19 which is wrong. q1 = 3.337e-19 ?

When finding Angular Acceleration, how is it that -7.129 x 10-4 rev/s2 equal to -4.47800 x 10-3 rad/sec2? In other words, how does the unit conversion work?

O! I get it! Thanks.

I don't understand. cos i x j = k ? So cos 2.12i x 2.12j = -2.194k ? Please explain it in numbers. How do I get -2.194k + 8.189k ?

When doing Angular Momentum, how is it that 2.0(2.12i + 2.12j) x (-3.863i - 1.035j) is equal to 2.0[-2.194k + 8.189k]?

Title says all.

Homework Statement A 4.8 g marble is fired vertically upward using a spring gun. The spring must be compressed 8.0 cm if the marble is to just reach a target 27 m above the marble's position on the compressed spring. (a) What is the change in the gravitational potential energy of the...

Homework Statement A railroad car moves under a grain elevator at a constant speed of 4.50 m/s. Grain drops into the car at the rate of 680 kg/min. What is the magnitude of the force needed to keep the car moving at constant speed if friction is negligible? Homework Equations p = mv...

So for (a), what do you mean by crests? So for (b), you use U= 1/2kx^2? So for (c), how do I find kinetic energy again?

Homework Statement The figure below shows the x(t) curves for three experiments involving a particular spring-box system oscillating in SHM. (a) Rank the curves according to the system's angular frequency, greatest first (use only the symbols > or =, for example 1>2=3). (b) Rank the curves...

Never mind. I found the answers. (a) 23 mm (b) 45 N Thanks for nothing. lol.

1. Problem A spring with a pointer attached is hanging next to a scale marked in millimeters. Three different packages are hung from the spring, in turn, as shown below. (a) Which mark on the scale will the pointer indicate when no package is hung from the spring? (a) ? mm (b) What is the...