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Gekata [30.6K]
3 years ago
13

When a 40V battery is connected across an unknown resistor there is a current of 100 ma  in the circuit.

Physics
2 answers:
vampirchik [111]3 years ago
6 0
400 ohms because 4 times 100
amm18123 years ago
4 0

Answer:

R = 400 ohms.

Explanation: Voltage of the battery, V = 40 V. Current in the unknown resistor I = 100mA. Let R is the resistance of the resistor. It can be calculated using Ohm's law it gives the relationship between the voltage, resistance and current.. R = V/I. R = 40 V/10-¹A. R = 400 Ohm's. So, the value of the resistance of the resistor is 400 Ohm's

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A 56 kg woman climbs the stairs to a height of 5 m. Determine: a) what mechanical work
Aleonysh [2.5K]

Answer:

a) W = 2746.8[J]

b) W = 2992.05 [J]

Explanation:

Work is defined as the product of force by distance. We must bear in mind that the force that performs the work is the one that acts in the same direction of displacement.

For this case, we must calculate the weight of the woman, the weight is defined as the product of mass by gravity.

w=m*g\\

where:

w = weight [N] (units of Newtons]

m = mass = 56 [kg]

g = gravity acceleration = 9.81 [m/s²]

w=56*9.81\\w=549.36[N]

a)

W=F*d

where:

F = weight = 549.36[N]

d = distance = 5 [m]

W = 549.36*5\\W = 2746.8[J]

b)

The new mass will be the combination of the mass of the woman plus that of the load.

m_{new} = 56+5\\m_{new}=61[kg]

w_{new}=61*9.81\\w_{new}=598.41[N]

The new work done.

W =598.41*5\\W=2992.05[J]

4 0
3 years ago
Which light is most sensitive to the eyes?
san4es73 [151]

Answer:

Our eyes are most sensitive to the wavelengths corresponding to the yellow and green colors of the spectrum. Flashy signs and some fire engines are painted in a yellowish-green color to attract our attention.

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What are the units for measuring current and voltage
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The unit for measuring voltage is a " voltmeter ".

The unit of measure for electrical current is the " Ampere ".

The unit of measure for potential difference (voltage) is the " volt ".


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ThIs is the same type of problem
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3 years ago
What is friction? How does it affect the motion of an object?
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"a lubrication system that reduces friction"

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