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sattari [20]
4 years ago
14

HELP ASAPPP which statement explains the first law of thermodynamics a)energy is created and destroyed or b) energy is transform

ed and transferred.
Physics
2 answers:
Aliun [14]4 years ago
7 0
B I believe... :) good luck!
Alex_Xolod [135]4 years ago
6 0
The answer is B I’m pretty sure :)
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A test charge of +4 µC is placed halfway between a charge of +6 µC and another of +2 µC separated by 20 cm. (a) What is the magn
S_A_V [24]

Answer:

(a) Magnitude: 14.4 N

(b) Away from the +6 µC charge

Explanation:

As the test charge has the same sign, the force that the other charges exert on it will be a repulsive force. The magnitude of each of the forces will be:

F_e = K\frac{qq_{test}}{r^2}

K is the Coulomb constant equal to 9*10^9 N*m^2/C^2, q and qtest is the charge of the particles, and r is the distance between the particles.

Let's say that a force that goes toward the +6 µC charge is positive, then:

F_e_1 = K\frac{q_1q_{test}}{r^2}=-9*10^9 \frac{Nm^2}{C^2} \frac{6*10^{-6}C*4*10^{-6}C}{(0.1m)^2} =-21.6 N

F_e_2 = K\frac{q_2q_{test}}{r^2}=9*10^9 \frac{Nm^2}{C^2} \frac{2*10^{-6}C*4*10^{-6}C}{(0.1m)^2} =7.2 N

The magnitude will be:

F_e = -21.6 + 7.2 = -14.4 N, away from the +6 µC charge

3 0
4 years ago
A 2,000-kg test car, traveling 60 m/s hits a brick wall. Using motion pictures, the time involved is determined to be 0.050 s. W
Naily [24]

change in momentum of car is given as

\Delta P = P_f - P_i

here we have

\Delta P = m(v_f - v_i)

given that

m = 2000 kg

v_f = 0

v_i = 60 m/s

now we have

\Delta P = 2000(0 - 60)

\Delta P = - 1.2 \times 10^5 kg m/s

8 0
3 years ago
An object is 12 m long, 0.65 m wide, and 13 cm high. Calculate the volume of this object.
ziro4ka [17]

The volume corresponds to the measure of the space occupied by a body. From the given dimensions we can intuit that we are looking to find the Volume of an Cuboid, that is, an orthogonal rectangular prism, whose faces form straight dihedral angles.

Mathematically the volume of this body is given as

V = lWh

Where,

L = Length

W = Width

H = High

V = (12)(0.65)(13*10^{-2})

V = 1.014m^3

Note: The value given for the height was in centimeters, so it was transformed to meters.

6 0
3 years ago
Please help me! Thank you so much!
hodyreva [135]
See the attached image! Thanks!

5 0
4 years ago
HNO3 (aq) + H20 (1) ► NO3- (aq) + H30+ (aq)
vodomira [7]

Answer:

It's H3O+.

Explanation:

The H3O+ ion in the solution is what gives it its acidic properties ( sour taste, low pH , for example). Its known as the hydronium ion.

8 0
3 years ago
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