🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →
Log in
Physics
1
answer
0
watching
120
views
23 Nov 2019

According to two conservation laws: the conservation of energy andthe conservation of momentum. Momentum is a vector quantity and so,for example, it can "be negative". On the other hand, energy isalways positive. How do these differences change the ways in whichthe two conservation laws work?

Watch
1
answer
0
watching
120
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Casey Durgan
Casey DurganLv2
4 Oct 2019

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share

Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

I tried to use conservation of momentum p_f = p_i and then sub formass of radiation as E = mc^2 But it left the box NOT MOVING whichthe second part of the question implies that the box ISMOVING


Einstien showed that there is mass associated with electromagneticradiation. Consider a box of length L and mass M resting on africtionless surface. At the left wall of the box is a light sourcethat emits radiation of energy E, which is absorbed momentum ofmagnitude of
p = E/c
find the recoil velocity of the box such that momentum mechanics.When the light is absorbed at the right wall of the box, the boxstops, so the total momentum remains zero. If we neglect the verysmall velocity of the box, the time it takes for the radiation totravel across the box is delta t = L/c. Find the distance move bythe box in this time, show that if the centre of mass of the systemis to remain at the same place, the radiation must carry mass
m=E/c^2

Please this is a Gordon Rule question derived from 7th or8thedition of general physics by James and susan Walker
Q#1
(a) can a centripital force ever do work on an object? .pleaseexplain in great detail.
(b)why is it easier to climb a steep mountain via azigzagtrail (switchbacks) than to climb straight up?
(c) how could a small force ever exert a greate torque thanalarger force? . please explain in detail.
(d) explain how conservation of angular momentum applies toanice skater spinning on the ice.

Two hockey pucks approach each other as shown in the figure below.Puck 1 has an initial speed of 23 m/s, and puck 2 has an initialspeed of 6 m/s. They collide and stick together.

(a) If the two pucks form a "system," is the momentum of thissystem along x or y conserved?
1 ---Select--- yes no

(b) Find the components along x and y of the initial velocities ofboth particles. v1xi = 2 m/s
v1yi = 3 m/s
v2ix = 4 m/s
v2iy = 5 m/s

(c) Express the conservation of momentum condition for motion alongx and y. (Do this on paper. Your instructor may ask you to turn inthis work.)

(d) Is this collision elastic or inelastic?
6 ---Select--- elastic inelastic

(e) Find the final velocity of the two pucks after the collision.vf = 7 m/s
? = 8° counterclockwise from the +x-axis

(f) What fraction of the initial kinetic energy is lost in thecollision?
9

Weekly leaderboard

Home
Homework Help 3,900,000
Physics 110,000
Start filling in the gaps now
Log in