A crane with output power of 200W will lift a 600N object a vertical distance of 4.0 meters in seconds

Which of the following statements is/are true? Check all that apply. Check all that apply. The work done by a nonconservative fo

navik [9.2K]

Answer:

The work done by a nonconservative force depends on the path taken. TRUE

A nonconservative force permits a two-way conversion between kinetic and potential energies. TRUE

A potential energy function can be specified for a nonconservative force.

FALSE

The work done by a conservative force depends on the path taken.

FALSE

A conservative force permits a two-way conversion between kinetic and potential energies.

FALSE

A potential energy function can be specified for a conservative force.

TRUE

Explanation:

The work done by a nonconservative force depends on the path taken. TRUE

This kind of force can not be obtained from potential function so the work made by this kind of force depend of the path taken.

A nonconservative force permits a two-way conversion between kinetic and potential energies. TRUE

A nonconservative force permits conversion to kinetic energy plus potential energy during it made work over the system.

A potential energy function can be specified for a nonconservative force.

FALSE

Considering that the work made by kind of force depend of the taken path they can not be determined by a potential fuction.

The work done by a conservative force depends on the path taken.

FALSE

This asseveration is related with the previous one. So the conservative force can be deducted from a potential function thus their y work made do not depend of the path taken.

A conservative force permits a two-way conversion between kinetic and potential energies.

FALSE

This means that as conservative force is related from a potential function it only can modify the potential energy of the system.

A potential energy function can be specified for a conservative force.

TRUE

This is as consequence of the definition of conservative force that it can be determined from a potential function.

4 0

2 years ago

a student moves a box across the floor by exerting 23.3 N of force and doing 47.2 J of work on the box. How far does the student

kozerog [31]

Work = Force x Distance
47.2J = 23.3N x d
d = 47.2/23.3
d = 2.0258 m

hope this helps :P

8 0

2 years ago

Samantha wants to study circus performance when she gets to college. She has mastered many physical skills already, but she keep

Mekhanik [1.2K]

Power is what she should work on.

8 0

2 years ago

Read 2 more answers

A biophysics experiment uses a very sensitive magnetic field probe to determine the current associated with a nerve impulse trav

fenix001 [56]

Answer:

The peak current carried by the axon is 5.85 x 10⁻⁸ A

Explanation:

Given;

distance of the field from the axon, r = 1.3 mm

peak magnetic field strength, B = 9 x 10⁻¹² T

To determine the peak current carried by the axon, apply the following equation;

$B = \frac{\mu I}{2\pi r}$

where;

B is the peak magnetic field

r is the distance of the magnetic field from axon

μ is permeability of free space = 4π x 10⁻⁷

I is the peak current

Re-arrange the equation and solve for "I"

$B = \frac{\mu I}{2\pi r} \\\\I = \frac{B*2\pi r}{\mu} \\\\I = \frac{9*10^{-12}*2*\pi *1.3*10^{-3}}{4\pi *10^{-7}} \\\\I = 5.85 *10^{-8} \ A$

Therefore, the peak current carried by the axon is 5.85 x 10⁻⁸ A

7 0

2 years ago

A heat recovery system (HRS) is used to conserve heat from the surroundings and supply it to the Mars Rover. The HRS fluid loop

Annette [7]

Answer: Volume of Freon = 12.23. $10^{3}$ L

Explanation: First, the temperatures have to be in the same unit, so all the tmeperatures is transformed into Kelvin:

T₁ = 192K

T₂ = $\frac{5}{9}$ . (F - 32)+273.15

T₂ = $\frac{5}{9}$ . (- 65 - 32)+273.15

T₂ = 219.26K.

Second, BTU is an unit of energy. It can be transformed into Joules by the relation 1BTU = 1055.06J.

Q = 1055.06 . 46.9 = 49482.314J

The letter Q represents Heat and is calculated as Q = m.Cp.ΔT, where:

m is mass of the element;

Cp is the heat capacity specific for each element;

ΔT is the difference between the final and initial temperature;

Third, it will be needed the properties of the Freon:

Freon (CF2Cl2) = 120.91g/mol; Cp = 74J/mol.K; ρ = 1.49kg/m³

Fourth, we calculate the mass of Freon necessary for the remove of 46.9BTU of energy from the system:

Q = m.Cp.ΔT

m= $\frac{Q}{c(T-T_{0} )}$

m = $\frac{49482.314}{74(219.26-192)}$

m = 18228.214g or m=18.228Kg

Fifth, using the density of Freon, Volume can be found

ρ = $\frac{m}{V}$

V = m / ρ

V = 18.228 / 1.49

V = 12.23m³

As SI for density is Kg/m³, the volume found is in m³.

Cubic meters is related to Liters as the following: 1m³=1000l.

So, volume of Freon = 12.23. $10^{3}$ L

The volume of Freon needed is 12.23. $10^{3}$ L.

7 0

2 years ago