5. Kelvin applied a rightward force of 302 N to a 29 kg desk to accelerate it across the floor. Thecoefficient of friction between the desk and the floor is 0.750.
a. Calculate the Force Friction
FN

Answer:

Explanation:

Ohm's Law is V = IR    Voltage = Current x Resistance

Therefore, I = V/R

Part 1:  The longer the wire, the greater the resistance.  Therefore, to keep the current, I, at a steady 10 mA, you need to increase the voltage if you're going to lengthen the wire.  Increase the battery voltage by using a higher voltage battery, or connect more batteries in series until you have sufficient voltage.

Part 2:  For the toaster, you need the resistance in the wires to be high in order for the wires to glow and get hot.  Toasting wires need to be made from a material with high resistance and to coil or loop them to increase the length.  Also, the thinner the wire, the higher the resistance.  In summary, choose a wire material that has a high resistance and use thin wire that is coiled or looped.  Of course, you have to make sure that the "toasting wires" don't get so hot that they catch fire.

Answer:

Explanation:

I'd be happy to help you with the questions related to Ohm's Law and circuit design:

Ways to Change Resistance in a Circuit:

Resistance in a circuit can be changed by adjusting the following factors:

Length of the Conductor: Increasing the length of a wire increases its resistance.

Cross-Sectional Area: Reducing the cross-sectional area of the conductor increases resistance.

Material: Different materials have different resistivity. Choosing a material with higher resistivity increases resistance.

Temperature: Resistance of most conductors increases with temperature.

Maintaining a Steady Current with Increased Wire Length:

If you need to maintain a steady current of 10 milliamperes while greatly increasing the length of the wire between the battery pack and the appliance, you should reduce the resistance in the circuit. To do this:

Use a wire with a larger cross-sectional area (lower resistance).

Select a material with lower resistivity.

Increase the voltage from the battery pack, keeping in mind the power requirements of the device, to compensate for the increased resistance due to the longer wire.

Designing a Toaster with Low Voltage:

To design a toaster that operates at a lower voltage while using hot, glowing wires, you can consider the following characteristics for the "toasting" wires:

High Resistivity Material: Use a material with high resistivity, which will heat up quickly with less voltage applied. Nichrome wire is commonly used for this purpose.

Long and Thin Wires: Long and thin wires will have higher resistance and heat up more with less voltage. Ensure the wires are designed for the required power.

Temperature Control: Implement a temperature control system to maintain the wires at the desired temperature range for toasting while minimizing power consumption.

Insulation: Proper insulation should be used to ensure safety and prevent electrical hazards.

Safety Mechanisms: Incorporate safety features to prevent overheating and potential fire hazards, as the wires will operate at high temperatures.

Keep in mind that safety is a crucial consideration when working with high-temperature wires, and it's essential to follow relevant electrical and safety standards when designing such devices.

Possible answers:

oceans/seas/lakes/rivers

atmosphere/sky

Explanation:

Most of the air's moisture evaporates from rivers, lakes, seas, and oceans. Water at the surface of the Earth evaporates into water vapor, which rises into the sky and forms clouds, which eventually release water back onto Earth as precipitation.

Answer:

A signal is produced.

Radio waves are modulated and amplified.

Radio waves are amplified and demodulated.

A signal is seen, heard, or used.

Explanation:

Communication is the method of transmitting information between two or more participants. A radio communication network is a set of static and wireless radio equipment developed to facilitate an entity by enabling particular modes of communication such as one-to-many and one-to-one communication. Radio waves are being used to transmit information spatially from the sender to receiver, by modulating the radio signal in the transmitter. The above steps explains the loop of the radio communication system.

Answer:

A signal is produced- 1

A signal is seen, heard, or used- 4

Radio waves are modulated and amplified- 2

Radio waves are amplified and demodulated- 3

Explanation:

got is correct on edge 2020

Answer: 450 J

Explanation:

Kinetic Energy = 1/2 × mass × velocity²

Kinetic Energy = 1/2 × 1.0 Kg × 30 m/s²

Kinetic Energy = 1/2 × 1.0 Kg × 900

Kinetic Energy = 450 J