Recent content by GoGoGadget

I understand the car accelerates. Before, I didn't understand the relevancy of finding acceleration with regard to the equation in my opening post. For having a constant velocity, you will have an acceleration of zero, which is the case in the first 10 second interval and again in the second...

In the first 10 seconds, the initial velocity appears to be constant. In the second 10 seconds, the final velocity is 30 m/s and it sounds like it is constant then too. But the question presents the 20 m/s velocity to still be the initial velocity and I wasn't making the connection before on why...

I don't think I fully understand this problem...

No, its velocity changes when it accelerates, right? It's increasing its velocity by 10 m/s I think..

Homework Statement Over a distance of 3 cm an electron accelerates uniformly from a speed of 9 x 103 m/s to a speed of 6 x 106 m/s. How long does it take the electron to cross this distance? Homework Equations d = 1/2(v0 + v)t The Attempt at a Solution Find t: d = 3 cm /10...

Homework Statement An automobile travels in a straight line for 10 seconds at 20 m/s than accelerates uniformly to a speed of 30 m/s in the next 10 seconds. Find the total displacement. Homework Equations d = 1/2(v0+v)t The Attempt at a Solution v0 = 20 m/s v = 30 m/s t =...

If the equation in my first post will help to find the total amount of time that it takes for the ball to complete the height, then would we need to find half the amount of time it would take for the ball to reach maximum height and then double that time to find the total time to reach the point...

Kinematics -- particle acceleration and distance travelled Homework Statement A particle moving at 10 m/s reverses its direction to move at 20 m/s in the opposite direction. If its acceleration is -10 m/s2, what is the total distance that it travels? A) 15 m B) 20 m C) 25 m D) 30...

Homework Statement A projectile launched straight up at 10 m/s will be in the air for: A) 1 s B) 1.4 s C) 2 s D) 5 s Homework Equations Not sure. The Attempt at a Solution I'm honestly not sure what to make of this problem. Since it's freefall, it sounds like we could...

Kinematics help -- object is dropped from a height h Homework Statement An object is dropped from a height h and strikes the ground with a velocity v. If the object is dropped from a height of 2h, which of the following represents its velocity when it strikes the ground? A) v B) 1.4v...

Yes, I believe I only need proton and neutron counts for determining mass of NaCl. However, do I also need to determine the number of molecules in the system too then? That I was unclear on. Otherwise, I know I'm also provided with the salinity and the density of the saltwater too so I'm not...

That link was a little bit too complex for this problem but thank for you it though. I think I figured it out otherwise. I have to think about the molecules being all over the place initially to then thinking about how the NaCl molecules are moved to one third the volume of the water. So it's...

Homework Statement For public health reasons, you are investigating small systems that turn sea water into drinking water. One portable system takes a volume of saltwater and produces two thirds that volume of freshwater with an increased concentration of salt in the other third of the volume...

Homework Statement 2. You have been asked to evaluate a new device designed to hold arteries open. The design has three identical very small spheres connected in an equilateral triangle by three identical small springs. When inserted into an artery, the springs are compressed. To determine...

Homework Statement You have a job at a medical forensics lab investigating an accident at a commuter railroad station. Your task is to determine the response of the safety system that prevented a railroad car from crashing into the station. Because the brakes on the passenger car failed, it...