PHYSICS HIGH SCHOOL

If an elephant is chasing you in a straight line, its mass is threatening but if you zigzag, you have an advantage why?

Answers

Answer 1

Answer: I believe it is because, due to the elephant's size, it makes it harder to change direction.

Answer 2

Answer:

Answer:

What the other guy said

Related Questions

What do we mean by the event horizon of a black hole?A) It is the place where X rays are emitted from black holes.B) It is the very center of the black hole.C) It is the point beyond which neither light nor anything else can escape.D) It is the distance from the black hole at which stable orbits are possible.
An event occurs in system K’ at x’ = 2 m, y’ = 3.5 m, z’= 3.5 m, and t’= 0. System K’ and K have their axes coincident at t = t’= 0, and system K’ travels along the x axis of system K with a speed 0.8c. What are the coordinates of the event in system K?
SCIENCE HELP If you are applying a force to an object and another person is applying another force to the object what is going to happen to the object? Construct your hypothesis using an “If…, then…” statement.
What will be the velocity of body in horizontal motion of the body in the air?
N a nuclear reaction, mass must be lost to produce energy. true or false

Which of the following best describes a direct current

Answers

Direct current-is the unidirectional flow or movement of electric charge carries(which are usually electrons.

its an unidirectional flow of electric charge

hope this helps!

Dark matter may explain _____.A.unexpected orbital velocities of stars in galaxies
B.the source of energy that fuels stars
C.the expansion of the universe
D.the origin of life
E.what came before the big bang

Answers

Answer: A.unexpected orbital velocities of stars in galaxies

Explanation:

Dark Matter makes up about 80% of matter in the universe. This matter does not emit light and hence, it is called dark matter as it cannot be observed directly.

The effect of the presence of the dark matter is unexpected orbital velocities of stars in galaxies. At the center, the orbital velocities are greater than those at the edge. Had there been no dark matter, the galaxy would have flown apart.

Dark matter may explain unexpected orbital velocities of stars in galaxies.

Which one of the following types of electromagnetic radiation causes certain substances to fluoresce? A. Cosmic rays
B. Ultraviolet rays
(C. X rays)
D. Infrared waves

A virtual image produced by a lens is always

A. located in front of the lens.
(B. located in the back of the lens.)
C. smaller than the object.
D. larger than the object.

Reflecting telescopes are popular because they're

A. more durable than a refracting telescope.
B. more powerful than a refracting telescope.
C. easier to build than a refracting telescope.
(D. smaller than a refracting telescope.)

The unit for measuring the rate at which light energy is radiated from a source is the

A. lux.
B. lumen.
(C. candela.)
D. Angstrom

A magnifying glass is an example of a _______ lens.

A. plano-concave
(B. plano-convex)
C. double-concave
D. converging

my answer is in ( ) and the answers are wrong please tell me the correct answer because i dont have a clue

Answers

1. Answer;

B. ultraviolet rays

Ultraviolet rays are the type of electromagnetic radiation that causes certain substances to fluoresce.

Explanation;

UV light is an electromagnetic radiation present in sunlight, that is shorter in wavelength than visible light and longer than X-rays.
Ultraviolet radiation is undetectable by the human eye, however, when it falls on certain substances, it may cause them to fluoresce that is emit electromagnetic radiation of lower energy, such as visible light.
Fluorescence is a phenomenon that causes a mineral to glow within the visible spectrum when exposed to ultraviolet light.

2. Answer;

B. located in the back of the lens.

Explanation;

Virtual images are those images that are locations from where lights appears to have converged. Additionally, virtual images can not be reproduced on a a screen, and occur on the opposite side of the object and are always upright.

Virtual images are formed by the diverging or concave lenses or by placing the object inside the focal length of a converging lens. The image is located at the back of the lens.

3. Answer;

C. easier to build than a refracting telescope.

Explanation;

Reflecting telescopes are those telescopes that uses mirrors to focus the light while refracting telescopes uses lenses to focus the light.
Reflecting telescopes have many advantages over refracting telescopes. These includes, the fact that mirrors don't cause chromatic aberration and they are easier and cheaper to build large.
Additionally, they are easier to mount because the back of the mirror can be used to attach to the mount.

4. Answer

C. Lumen

The unit for measuring the rate at which light energy is radiated from a source is the Lumen.

Explanation;

Luminous flux is the time rate of the flow of light, or the visible energy produced from a certain light source. It is the quantitative measure of brilliance of a light source. The unit of luminous flux is lumen (lm.
Luminous intensity on the other hand is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle. Luminous intensity is measured in Candela.
We could say that one lumen is the luminous flux of the uniform point light source that has a luminous intensity of 1 candela.

5. Answer;

B. Plano-convex lens

A magnifying glass is an example of a plano-convex lens.

Explanation;

Convex lenses are types of lenses that are thicker at the center and thinner at the edges. Plano-convex lens is a type of convex lens.

Plano-convex lenses are types of lenses that are positive focal length elements with one spherical surface and one flat surface.
These types of lenses are designed for parallel light use or simple imaging. therefore they are ideal for all purpose focusing elements.
Magnifying glass is a type of convex lenses and an example of plano-convex lens, that is used to produce magnified image of an object.

1) It's B. Ultraviolet rays cause substances to fluoresce.
2) It's D. The lens enlarges the image.
3) It's actually more powerful so it's B. People usually buy products based on quality than portability.
4) CORRECT
5) CORRECT

An object is released from rest at time t = 0 and falls through the air, which exerts a resistive force such that the acceleration a of the object is given by a = g bv, where v is the object's speed and b is a constant. If limiting cases for large and small values of t are considered, which of the following is a possible expression for the speed of the object as an explicit function of time? A) v = g(1-e^-bt)/b B) v = (ge^bt)/b C) v = (g+a)t/b

Answers

Answer:

A) $(g)/(b)(1-e^(-bt))$

Explanation:

Since a = g - bv,

We can substitute a = dv/dt into the equation.

Then, the equation will be like dv/dt = g - bv.

So we got first order differential equation.

As known, v = 0 at t = 0, and v = g/b at t = ∞.

Since $(dv)/(dt)= g - bv = b( (g)/(b) - v)$ ⇒ $(dv)/( (g)/(b) - v)= bdt$

So take the integral of both side.

$- ln ((g)/(b) - v) = bt + C$

Since for t=0, v = 0 ⇒ $C =- ln ((g)/(b))$

$v = (g)/(b) + e^{-bt-ln((g)/(b))} = (g)/(b)- (g)/(b)e^(-bt) = (g)/(b)(1-e^(-bt))$

The correct option for the expression of speed as an explicit function of time is option A

A) v = g·(1 - $e^{-b \cdot t$ )/b

The reason why option A is correct is given as follows;

Known:

The initial velocity of the object at time t = 0 is v = 0 (object at rest)

The function that represents the acceleration is a = g - b·v

Where;

v = The speed of the object at the given instant

b = A constant term

By considering the limiting case for time t, we have;

At very large values of t, the velocity will increase such that we have;

$\lim \limits_(t \to \infty) a = 0$ therefore, $\lim \limits_(t \to \infty) g - b\cdot v = 0$ and $\lim \limits_(t \to \infty) \left( v_(max) = (g)/(b) \right)$

The given equation can be rewritten as follows, to express the equation in terms the velocity;

$a = b \cdot \left((g)/(b) - v \right) = b \cdot \left(v_(max) - v \right)$

$Acceleration, \ a = (dv)/(dt)$

Therefore;

$(dv)/(dt) = b \cdot \left((g)/(b) - v \right)$

The above differential equation gives;

$(dv)/( \left((g)/(b) - v \right)) = b \cdot dt$

Which gives;

$\displaystyle \int\limits {(dv)/( \left((g)/(b) - v \right)) } = \int\limits {b \cdot dt} = b \cdot t + C$

$\displaystyle \int\limits {(dv)/( \left((g)/(b) - v \right)) } = -\ln \left((g)/(b) - v \right)$ and $\displaystyle\int\limits{b \cdot dt} = b \cdot t + C$

Therefore

$\displaystyle -\ln \left((g)/(b) - v \right) =b \cdot t + C$

At t = 0, v = 0, therefore;

$\displaystyle -\ln \left((g)/(b) - 0 \right) =b * 0 + C$

$C = \displaystyle -\ln \left((g)/(b) \right)$

Which gives;

$\displaystyle -\ln \left((g)/(b) - v \right) =b \cdot t \displaystyle -\ln \left((g)/(b) \right)$

$\displaystyle \ln \left((g)/(b) - v \right) =-b \cdot t \displaystyle +\ln \left((g)/(b) \right)$

$\displaystyle (g)/(b) - v = e^{-b \cdot t \displaystyle +\ln \left((g)/(b) \right)} = e^(-b \cdot t) * e^\ln \left((g)/(b) \right)} = e^(-b \cdot t) * (g)/(b)$

$\displaystyle (g)/(b) - e^(-b \cdot t) * (g)/(b) = v$

$\displaystyle (g)/(b) \cdot \left(1 - e^(-b \cdot t) \right) = v$

∴ v = g·(1 - $e^{-b \cdot t$ )/b

The correct option is option (A)

Learn more about differential equation here;

brainly.com/question/13309100

The equation that relates the temperature of an object to the wavelength of its peak radiation is called _____.the blackbody law
Wien's law
Kepler's law
the spectral law

Answers

The equation that relates the temperature of an object to the wavelength of its peak radiation is called Wien's law. Wien's law states that: the black body radiation curve for different temperatures peaks at a wavelength inversely proportional to the temperature.

Answer:

The correct choice is

Wien's law

Explanation:

According to Wien's law, wavelength of maximum intensity of emission of black body radiation is inversely proportional to absolute temperature (T) of the black body. The formula for the law is given as

$\lambda _(m)\propto (1)/(T)\n$

$\lambda _(m)= (b)/(T)\n$

where

$\lambda _(m)$ = wavelength of maximum intensity

T = temperature

b = Wien's constant

The weight of an object isa. the force of gravity on its mass.
b. the amount of matter in an object.
c. the tendency of an object to resist motion.
d. the tendency of an object to continue moving in a straight line.

Answers

The weight of an object is the force of gravity on its mass. The answer is letter A. The acceleration due to gravity is the acceleration on an object caused by force of gravitation. It means that the earth has a gravitational field that projects all bodies on earth towards its center. The gravity of an object or body of an object is high on earth than at the atmosphere. It has an average of gravitational constant equal to 9.8066 or 9.8 meters per second. In truth, the acceleration of the object depend upon its location, the latitude and altitude, on earth.

Other Questions

The potential energy is calculated as ____ (use g=10m/s^2 for your calculating)

Law of conservation of momentum

Why dog pants during summer use the cocept of evaporation

What three forms of kinetic energy can a polyatomic molecule have?