How do you calculate average resistive force?
The average resistance force is the change in momentum divided by the time required to stop the bullet. The distance covered under constant acceleration is 1/2 a* t^2. The average acceleration is the change in velocity divided by the time.
How do you calculate average force?
Therefore, the mass of the object multiplied by the average velocity over the definite time is equivalent to the average force….The formula for the average formula:
| F | Average Force |
|---|---|
| m | Mass |
| V f V_f Vf | Final velocity |
| V i V_i Vi | Initial velocity |
| Δ t \Delta t Δt | Time |
What is resistive force?
In physics, resistive force is a force, or the vector sum of numerous forces, whose direction is opposite to the motion of a body, and may refer to: Friction, during sliding and/or rolling. Magnetic repulsion, when a magnetic object moves against another magnetic field.
How do you find the resistive force of air?
The units for the force of air resistance are in Newtons (N). Air resistance can be calculated by taking air density times the drag coefficient times area all over two, and then multiply by velocity squared.
How do you calculate water resistance?
*S = 1.0 for water at 80°F. **V = 1.0 for water at 80°F….How to Calculate Flow Resistance for Liquids.
| d | = | orifice diameter (inches) |
|---|---|---|
| Cd | = | coefficient of discharge |
| Cv | = | flow coefficient |
Does air resistance increase with speed?
The increase in speed leads to an increase in the amount of air resistance. Eventually, the force of air resistance becomes large enough to balances the force of gravity. The change in velocity terminates as a result of the balance of forces. The velocity at which this happens is called the terminal velocity.
Why does drag force exist?
Drag is the aerodynamic force that opposes an aircraft’s motion through the air. Drag is generated by the difference in velocity between the solid object and the fluid. There must be motion between the object and the fluid. If there is no motion, there is no drag.
Does water have resistance?
Resistivity is measured in Ohms. When salts dissolve into water, free ions are created. These ions are able to conduct an electrical current….What is resistivity in water?
| Type of Water | Approximate resistivity in Ohms (Ω) |
|---|---|
| Pure Water | /td> |
| Distilled Water | 500,000 |
| Rain Water | 20,000 |
| Tap Water | 1,000 – 5,000 Ω |
Does water reduce resistance?
Electricity flows more easily through some materials than others. Substances such as metals offer little resistance to the flow of electric current and are called “conductors”. How does water affect the flow of electricity? Pure water is a poor conductor.
Does water increase electrical resistance?
The increase in water causes the electrical resistance between the electrodes to decrease.
Which conductor has highest resistivity?
Resistivity and Temperature Coefficient at 20 C
| Material | Resistivity ρ (ohm m) | Conductivity σ x 107 /Ωm |
|---|---|---|
| Silver | 1.59 | 6.29 |
| Copper | 1.68 | 5.95 |
| Copper, annealed | 1.72 | 5.81 |
| Aluminum | 2.65 | 3.77 |
What is the best conductor of electricity?
The most highly conductive metals are silver, copper, and gold. Copper, for example, is highly conductive and commonly used in metal wiring. Brass, on the other hand, contains copper but other materials in its makeup reduce conductivity. Pure silver is the most conductive of all metals.
Which has higher resistivity Ge or Si?
Pure germanium has a resistivity of 60 ohm–centimeters. Pure silicon has a considerably higher resistivity, in the order of 60,000 obm-centimeters.
What material has the highest resistance to electricity?
The material that has the highest electrical resistance is silver. After silver copper and gold are the materials that have the highest electrical resistance.
What material has lowest electrical resistance?
copper
Which has more resistance tungsten or Nichrome?
Your observation about Nichrome having a much higher resistivity than Tungsten is a very good one. For example, while Nichrome does have a much higher resistivity than Tungsten, Tungsten has a much higher melting point than Nichrome (Nichrome MP = 1400 C, Tung MP = 3422 C).
What is the lowest resistance metal?
silver
Is silver low resistance?
Silver has a very low level of resistivity but it is not so widely used because of its cost and because it tarnishes which this can result in higher contact resistances.
What metal has the highest resistivity?
The various high resistivity materials (including alloys) are described below:
- Tungsten: (i) Hard metal.
- Carbon: (i) ρ = 1000 to 7000 μ ohm cm, α = – 0.0002 to – 0.0008.
- Nichrome or Brightray B: Composition:
- Nichrome V or Brightray C:
- Manganin:
- Constantan or Eureka:
- German Silver or Nickel Silver or Electrum:
- Nirosta:
Why do metals have low resistance?
Answer:Conductors have number of free electrons in them hence they have low resistance. As number of electrons increases resistance of the matter decreases because number of electrons will decide flow of current or heat through it.
Do metals have low resistance?
So, metals generally have a relatively low (though not zero) resistance. In a material such as glass, there is a large energy gap between the valence and conduction band. Within a metal conductor, even though there are free electrons, there is still resistance to current flow.
Does resistivity increase with length?
Resistivity is an intrinsic property of any material. It stays the same, no matter how long or thick your conductor is. Temperature coefficient*original resistivity*change in temperature. So there is no change with length in resistivity but resistance changes in direct proportion with length of the conductor.
What four things determine an object’s resistance?
There are 4 different factors which affect resistance:
- The type of material of which the resistor is made.
- The length of the resistor.
- The thickness of the resistor.
- The temperature of the conductor.
Does diameter affect resistance?
As we know that resistance of a wire is inversely proportional to the square of its diameter. Thus when the diameter of a wire is doubled (made 2 times), its resistance becomes one-fourth (1/4), and if the diameter of a wire is halved (made 1/2), then its resistance becomes four times (4 times).
Does a thicker wire have more resistance?
The longer a wire is the more resistance it has due to the longer path the electrons have to flow along to get from one end to the other. The larger the cross sectional area, the lower the resistance since the electrons have a larger area to flow through. This will continue to apply no matter how thick the wire is.
What does not affect a material’s resistance?
Length and area affect resistance as well as type of material expressed with . Temperature does not affect resistance.
What factors affect resistance readings?
There are several factors that affect the resistance of a conductor;
- material, eg copper, has lower resistance than steel.
- length – longer wires have greater resistance.
- thickness – smaller diameter wires have greater resistance.
- temperature – heating a wire increases its resistance.
Does temperature affect resistance?
Heating a metal conductor makes it more difficult for electricity to flow through it. These collisions cause resistance and generate heat. Heating the metal conductor causes atoms to vibrate more, which in turn makes it more difficult for the electrons to flow, increasing resistance.
What does not change the resistance of a wire?
Answer on Question #45708, Physics, Electromagnetism The only item not listed here is voltage. Voltage value is not affect resistance (if we will not take into account any temperature changes).