Answer:
μ = 0.161
Explanation:
Since the tension on the rope (F) is being applied at an angle (θ), it should be decomposed into a vertical and a horizontal component.
The vertical component of the tension on the rope (F*sin(θ)) is pulling the sled upwards, decreasing the normal force.
Therefore, the normal force can be calculated as:
The horizontal component of the tension on the rope (F*cos(θ)) is the force being applied to move the sled and that should equal the coefficient of friction multiplied by the normal force.
the coefficient of friction between the sled and the ground is 0.161
Answer:
The resistance for the second resistor is R2 = 240 Ohms and the equivalent resistance is Requivalent = 280 Ohms.
Explanation:
The resistance of a ohmic resistor is influeced by the type of it's material and by the it's construction. The longer the wire the greater the resistance and the greater the cross-sectional the lower the resistance. This can be expressed by the following equation:
R = (p*L)/A
Where p is a constant for the material of the resistor, L is the length of the wire and A is the area of the cross-sectional. In our case we have a resistor R1 that has a resistance of 40 Ohms, while a second resistor R2 made with the same material but with double length and half cross sectional. If we say that R1 is:
R1 = (p*L)/A
Then R2 must be:
R2 = (p*3*L)/(A/2)
Because the only things that changed were the length and area of the cross-sectional. We can now relate both resistors to find the second resistance, using the equation for R2. So we have:
R2 = [3*(p*L)/A]*2 = 6*(p*L)/A = 6*R1
We know that R1 is 40 Ohms so R2 = 6*40 = 240 Ohms.
The equivalent resistance of a series connection is the sum of the individual resistances, so we have:
Requivalent = R1 + R2 = 40 + 240 = 280 Ohms.
Answer:
Is the mass number
Explanation:
Every atom is usually identified by using two different numbers:
- Atomic number: generally labelled with Z, corresponds to the number of protons in the nucleus, so Z = p
- Mass number: generally labelled with A, corresponds to the number of protons+neutrons in the nucleus, so A = p + n
To find the number of neutrons in a nucleus, therefore, we can do
n = A - Z
Because it's maybe the only color they see.
Answer and Explanation:
The collision of particles (or moleclues) would need to be required. Say there are two gasses, one with a higher temperature and one with a lower one. The kenetic energy in the moleclues can move in random directions, and start to bump into each other. If the warmer particle collides with the cooler one then the warmer particle would be transferring <em>heat </em>which is thermal energy.<em> T</em>he particles colliding would be called <em>thermal conduction</em>.