Which describes an image that a concave mirror can make?

Answers

Answer 1

Answer: An image that a concave mirror can make is that it can form a real image that is projected out in front of the mirror. A concave mirror is a mirror that is curved inward in the middle. Using the mirror equation, you can deal with concave mirrors. It's like you're looking into a cave when try to look in a concave mirror.

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A horse has a kinetic energy of 29,400 j if the horse has a mass of 300 kg what is the horses speed?

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If a horse has a kinetic energy of 29,400 Joules if the horse has a mass of 300 kilograms, then the speed of the horse would be 14 m / s.

What is mechanical energy?

Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total stored energy in the system which is represented by total potential energy.

The expression for total mechanical energy is as follows

ME = PE + KE

As given in the problem a horse has a kinetic energy of 29,400 j if the horse has a mass of 300 kg,

The kinetic energy of the horse = 0.5 × 300 × v²

29400 = 150 × v²

v = 14 m / s

Thus , If a horse has a kinetic energy of 29,400 Joules if the horse has a mass of 300 kilograms, then the speed of the horse would be 14 m / s.

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kinetic energy = 29.400 j
m= 300 kg

kinetic energy = ½• m• v²
kinetic energy = ½•300•v²
29400= 150•v²
29400 : 150 = V²
196 = V²

√196 = V

14 = V

Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. The leaf of a corn plant has a resistance of 2.3 MΩ measured between two electrodes placed 20 cm apart along the leaf. The leaf has a width of 2.3 cm and is 0.20 mm thick.Part AWhat is the resistivity of the leaf tissue?Express your answer to two significant figures and include the appropriate units.ρ=________Part BIs this greater than or less than the resistivity of muscle tissue in the human body?(A) greater or(B) less

Answers

Answer:

Part a)

$\rho = 52.9 ohm- m$

Part b)

the resistivity of corn plant is grater than the resistivity of muscle tissue in the human

Explanation:

Part a)

As we know the formula of resistance is given as

$R = \rho (L)/(A)$

here we know that

$\rho = (RA)/(L)$

here we have

$R = 2.3 M ohm$

$L = 20 cm$

$Area = (0.023)(0.20 * 10^(-3))$

$Area = 4.6 * 10^(-6) m^2$

now we have

$\rho = ((2.3 * 10^6)(4.6 * 10^(-6)))/(0.20)$

$\rho = 52.9 ohm- m$

Part b)

Resistivity of mucle tissue of human is is ranging from 15 ohm-m to 50 ohm m so here we can say that

the resistivity of corn plant is grater than the resistivity of muscle tissue in the human

Veronica’s velocity was measured as 4.3 m/s. She displaced 20 meters in 4.7 seconds. Which piece of information is missing for the correct calculation of velocity? A) the starting point
B) the direction
C) the end point
D) the time per meter

Answers

The piece of information that is missing for the correct calculation of velocity is the direction.

What is velocity?

Velocity is the rate of change of distance. Velocity is a vector quantity. A vector quantity depends on magnitude and direction as well.

If forward direction, then velocity would be positive and if backward direction, it would be of negative.

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Answer:The Direction

Explanation: You gotta know where your going

suppose that you look into a photometer's eyepiece and the fluorescent disks appear to be equal in intensity. If the distance between the photometer to lamp 1 is 400mm, the distance between the photometer to lamp 2 is 200 mm, and the intensity of lamp 2 is known to be 15 candelas, what is the intensity to lamp 1?

Answers

Use the Inverse square law, Intensity (I) of a light is inversely proportional to the square of the distance(d).

I=1/(d*d)

Let Intensity for lamp 1 is L1 distance be D1 so on, L2 D2 for Intensity for lamp 2 and its distance.

L1/L2=(D2*D2)/(D1*D1)

L1/15=(200*200)/(400*400)
L1=15*0.25
L1=3.75 candela

A 50 kg ball rolls down the street at 5 m/s.
Calculate the momentum of the ball.

Answers

The momentum of the ball is250 Kgm/s

Given the following data;

Mass = 50 kg

Velocity = 5 m/s

To find the momentum of the ball;

Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. It is a vector quantity and as such has both magnitude and direction.

Mathematically, momentum is giving by the formula;

$Momentum = mass\; * \; velocity$