Search found 37 matches

by jeff
Mon Oct 15, 2018 8:06 pm
Forum: Physics Help
Topic: Given a cart and spring on incline, how do I find the period of oscillation?
Replies: 1
Views: 17

Re: Given a cart and spring on incline, how do I find the period of oscillation?

Hi Turnnirl, hi I need a question answered I need help on b A cart of mass m is attached to a vertical spring of force constant k so that the spring stretches 20 cm. When the cart is set into oscillatory motion on the vertical spring, the period of the oscillation is 3 seconds. The cart is set on an...
by jeff
Mon Oct 08, 2018 5:23 pm
Forum: Physics Help
Topic: circular motion and centripetal force
Replies: 4
Views: 19

Re: circular motion and centripetal force

I divided by 6.28 to get the revs thn divided by 60 to get minutes is the right? i got 0.009 in revs/minute Almost! dividing by 6.28 is correct (because we have to divide by 2 pi), but to convert seconds to minutes we have to multiply by 60, not divide. That's because the time unit of seconds is be...
by jeff
Mon Oct 08, 2018 4:10 pm
Forum: Physics Help
Topic: circular motion and centripetal force
Replies: 4
Views: 19

Re: circular motion and centripetal force

HI Brentzoom, centripetal acceleration correspond to acceleration which points in, i.e. a=v^2/r In training, military piots are given various tests. one test puts them in a seat on the end of a long arm of length 5m which is then spun around ar a high speed. at top speed the pilot will experience a ...
by jeff
Mon Oct 01, 2018 2:19 pm
Forum: Physics Help
Topic: What is the equation for displacement of a jet?
Replies: 3
Views: 10

Re: What is the equation for displacement of a jet?

RusselMank wrote:
Mon Oct 01, 2018 2:16 pm
It's hard to guess, but I saw this one

d = 1/2*(vo+vf)*t

Is that right?
Yes, that will work! If you plug in your values, that should give you the final answer. What do you get for that?
by jeff
Mon Oct 01, 2018 1:53 pm
Forum: Physics Help
Topic: What is the equation for displacement of a jet?
Replies: 3
Views: 10

Re: What is the equation for displacement of a jet?

Hi RusselMank, The statement of the problem is below. The first thing is they give us the initial velocity at the start time, and it is assumed that it accelerates at a constant rate. There is no air resistance,and the jet ends up going at 435m/s, which actually is the fnal velocity of the jet. The ...
by jeff
Mon Sep 17, 2018 2:14 pm
Forum: Physics Help
Topic: triple x and y components?
Replies: 3
Views: 23

Re: triple x and y components?

Hi GloriaVipsy , Ihad the same problem with different numbers. magnitude = 5 and angle is 30. I started by calculating the components, and tripled them. I then used the Pythagorean theorem. I got an answer of 15. Will it alwys just triple the total magntidue? Yes, that's right! If you multiply the c...
by jeff
Wed Sep 12, 2018 5:58 pm
Forum: Physics Help
Topic: the current through a light bulb is constant: true or false?
Replies: 1
Views: 17

Re: the current through a light bulb is constant: true or false?

Hi ShylaMal, Is the current in a light bulb greater immediately after it is turned on aor a few minutes later? explain your answer. I thought the current was the same because V=IR and V and R are constants so I must be constant. is that correct? it was marked wrong In this case, we cannot assume tha...
by jeff
Tue Sep 11, 2018 3:01 pm
Forum: Physics Help
Topic: Centripetal acceleration on a airplane in a circle
Replies: 4
Views: 17

Re: Centripetal acceleration on a airplane in a circle

Hi BiancaTex, Hey, how do you know if the a is centripetal or not? I tried a=v^2/r for some circular motion problem and get it wrong because there is a tangential as well. This doesn't make any sense, how can you sometimes have it and sometimes not? I know this is likely meaning something easy but I...
by jeff
Mon Sep 10, 2018 12:22 pm
Forum: Physics Help
Topic: Projectile Motion Kinematics
Replies: 4
Views: 22

Re: Projectile Motion Kinematics

Hi GloryCob, The problem statement is In laboratory situations, a projectile’s range can be used to determine its speed. To see how this is done, suppose a ball rolls off a horizontal table and lands 1.2 m out from the edge of the table. If the tabletop is 75cm above the floor, determine the time th...
by jeff
Tue Sep 04, 2018 5:46 pm
Forum: Physics Help
Topic: direction of electric field
Replies: 2
Views: 11

Re: direction of electric field

Hi jmalemulje, A negatively charged particle moving at constant speed from right to left enters a region of space where a uniform electric field exists (see figure). Once the particle enters the field, it slows, momentarily stops, and then moves back out of the field from left to right along the sam...