All categories

4 years ago

WILL GIVE BRAINLIEST!!!

1 answer:

6 0

A simple machine can make work easier by reduce the amount of energy needed to perform a task, therefore, B. it magnifies the potential energy so that the kinetic energy is greater is the correct answer:)

You might be interested in

Atoms of element A decay to atoms of element B with a half-life of 20,000 years. If there are 10,000 atoms of A to begin with (a

oee [108]

T = half life period of decay for atoms of element A = 20,000 years

N₀ = initial number of atoms of element A = 10,000 atoms

N = final number of atoms after time "t" = 2500 atoms

t = time of decay = ?

λ = decay constant = ?

decay constant is given as

λ = 0.693/T

λ = 0.693/20,000

λ = 0.00003465 years⁻¹

atoms after decay for time "t" is given as

N = N₀ $e^{-\lambda t}$

inserting the values

2500 = (10000) $e^{-(0.00003465) t}$

t = 40,000 years

so correct choice is

B) 40,000 years

4 0

3 years ago

Read 2 more answers

At target prctice, Scott holds his bow and pulls the arrowback

const2013 [10]

The notion of potential energy is related to the work done by the forces on the physical system to move it from one position to another in space. That is to say in practical terms it can be calculated by the Force applied in a certain distance. Mathematically this is

$PE = W = F*d$

Here,

PE = Potential Energy

W= Work

F = Force

d = Distance

Replacing we have,

$PE = 40*0.3$

$PE = 12J$

Therefore the potential energy stored in the bow the moment before the arrow is released is 12J.

3 0

3 years ago

Technician A says that failure analysis will assist the technician in determining whether it is more cost effective to replace r

Jobisdone [24]

Answer:

The correct option is;

Technician A

Explanation:

Here we note failure analysis will assist in determining the cause of failure and as such to determine the cost effectiveness of a repair or a replacement.

However, a warranty is a legal contract between the buyer of the engine and the manufacturer for the manufacturer to either repair the engine or compensate the the customer for all failures that occur within the period of the warranty. Therefore, technician B is not correct as he says the manufacturer may request the engine for analysis on why it failed which is not the same as the basis of a warranty.

6 0

3 years ago

A parallel-plate capacitor is constructed of two horizontal 15.6-cm-diameter circular plates. A 1.4 g plastic bead with a charge

MrRissso [65]

Answer: The upper plate is positive charged. b) 0.53 µC.

Explanation:

As the plastic bead is suspended between the two plates, the external forces acting upon it must be equal and opposite each other.

The external forces acting upon it, are gravity (always downward) and the on due to electric Field, which must aim upwards, to keep the system in equilibrium.

As the charge on which the force must be act is a negative charge, this means that the force and the electric field must aim in opposite direction, so the electric field must point from the upper plate to the lower one.

This means that the upper plate must be positive charged.

We can find out the magnitude of the electric field, as follows:

E = mg / q = 0.0014 Kg. 9.8 m/s2 / 4.4 x 10⁻⁹ C = 3.12. 10⁶ V/m

b) In order to know the charge on the positive charged plate, we know that the capacitance , by definition, is as follows:

C = Q /V

It can be showed, that for a parallel plate capacitor, the capacitance can be expressed as a relationship of geometric parameters, as follows:

C = ε₀ A / d

But, V and E are related linearly by the expression:

V= E. d

Equating both expressions for C, we have:

Q / E.d = ε₀ A / d , so we can simplify and solve for Q, as follows:

Q = ε₀ A E = 8.85. 10⁻¹² farad/m. π (0.156)2 . ¼. 3.12. 10⁶ V/m = 0.53 µC

4 0

4 years ago

If one motor has three times as much power as another, then the smaller power motor: A. can do the same work in the same time. B

Dvinal [7]

Answer:B

Explanation:

Given

First motor has three times as much as power as another

Let the power of smaller motor be P

Therefore bigger motor has power 3 P

and we know that energy $E=power\times time$

Larger motor $E=3P\times t=3Pt$

Smaller motor $E=P\times 3t=3Pt$

Therefore smaller motor will do same work if it takes three times the time taken by Larger motor

8 0

4 years ago