Given
Weight of the block A, Wa = 20 lb, weight of block B Wb = 50 lb. Applied
force to block A, P = 6lb, coefficient of static friction µs = 0.4, coefficient
of kinetic friction µk = 0.3. If a force P
is applied to the body, no relative motion will take place until the applied
force is equal to the force of friction Ff, which is acting opposite to the
direction of motion. Magnitude of static force of friction between block A and
block B, Fs = µsN, where N is
reaction force acting on block A. Now, resolve the forces Fx = max. P = (mA +
mB)a,
6 = (20 / 32.2 + 50 / 32.2)a
2.173a = 6
A = 2.76 ft/s^2
To check slipping occurs between block A and block B, consider block A:
P – Ff = mAaA
6 – Ff = 1.71
Ff = 4.29 lb
And also,
N = wA. We know static friction,
Fs = µsN
Fs = 0.4 x 20
Fs = 8lb
Frictional force is less than static friction. Ff < Fs
<span>Therefors, acceleration of block A, aA = 2.76 ft/s^2, acceleration of
block B aB = 2.76 ft/s^2</span>
If a negatively charged object is used to charge a neutral object by induction, then the neutral object will acquire a positive charge. And if a positively charged object is used to charge a neutral object by induction, then the neutral object will acquire a negative charge.
Average speed = distance travelled / time used
Ok I don’t know the answer I’m in 5th grade but 2431 is wrong
Let me think about this........ correct me if I am wrong.......
Laws of thermodynamics
1) Energy cannot be created nor destroyed. It is transferred.
2) All spontaneous reactions will increased the entropy of the universe (More disorder)
3) The entropy of the crystal lattice structure at 0 K is zero
PE(coal) --> Steam(K.E) ................ This will increase entropy and also conversion of energy. So BOTH LAWS is my final answer.
Wait...... I would like to use a lifelines...... I want to phone my Physical chem professor.
*Ring Ring.........*
Me: Hello, I wanted to make sure if I got the correct answer.
Chem prof: You dont need my help, since you got the right answer.
Me: WOOT!!!!!!!
