PHYSICS HIGH SCHOOL

At what launch angle will a projectile travel the farthest distance if launched on level ground? Multiple Choice: a. 45 degrees b. 60 degrees c. 20 degrees d. 30 degrees e. 75 degrees

Answers

Answer 1

Answer:

Answer:

A. 45 degrees

Explanation:

A projectile travels the farthest when it is launched at an angle of 45 degrees.

The maximum range is 45 degrees, ignoring air resistance.

sin(2θ) = 1

∴ 2θ = π/2.

(2θ)/2 = (π/2)/2

θ = π/4

π/4 or 45°

Answer 2

Answer:

Answer:

A. 45 degrees

Explanation:

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Which of these are considered an oxidizing mutagenic agent?a. x-rays
b. benzopyrene
c. gamma rays

Answers

X - rays are considered an oxidizing mutagenic agent. The answer is letter A. X-rays are high energy electrons that can cause damage when exposed under extreme conditions. The best technology that can block it is t using a lightweight type of metal foam. It can take in high energy collisions which also exhibits high forces. it does not only block x-rays but also, neutron radiation and gamma rays.

Answer: X-rays is what's considered an oxidizing mutagenic agent

List the following items in order of decreasing speed, from greatest to least: (i) A wind-up toy car that moves 0.15 m in 2.5 s. (ii) A soccer ball that rolls 2.3 m in 0.55 s. (iii) A bicycle that travels 0.60 m in 0.075 s. (iv) A cat that runs 8.0 m in 2.0 s. Knight, Randall D., (Professor Emeritus). College Physics (p. 28). Pearson Education. Kindle Edition.

Answers

Answer:

(iii) > (ii) > (iv) > (i)

Explanation:

Part (i):

$\textrm{Speed of the wind-up toy} = \frac{\textrm{distance traveled}}{\textrm{Time taken}}\n\Rightarrow v_1=(0.15\ m)/(2.5\ s)\n\Rightarrow v_1 = 0.06\ m/s$

Part (ii):

$\textrm{Speed of the soccer ball} = \frac{\textrm{distance traveled}}{\textrm{Time taken}}\n\Rightarrow v_2=(2.3\ m)/(0.55\ s)\n\Rightarrow v_2 = 4.18\ m/s$

Part (iii):

$\textrm{Speed of the bicycle} = \frac{\textrm{distance traveled}}{\textrm{Time taken}}\n\Rightarrow v_3=(0.66\ m)/(0.075\ s)\n\Rightarrow v_3 = 8.8\ m/s$

Part (iv):

$\textrm{Speed of the cat} = \frac{\textrm{distance traveled}}{\textrm{Time taken}}\n\Rightarrow v_4=(8.0\ m)/(2.0\ s)\n\Rightarrow v_4 = 4.0\ m/s$

From the above calculations, we have

$v_3>v_2>v_4>v_1$

So, the speed in the parts mentioned arranged in decreasing order as follow:

(iii) > (ii) > (iv) > (i)

Assume that you have a mass of 50.0kg and earth has a mass of 5.97x10kg.The radius of earth is 6.38x10m.What is the force of gravitational attraction between you and the earth

Answers

The formula for force of attraction between any two bodies in the universe
F = GMm / r^2. (Newton's Universal law of Gravitation).

G = Universal gravitational constant, G = 6.67 * 10 ^ -11 Nm^2 / kg^2.
M = Mass of first object. = 5.97 x 10^24 kg.
m = mass of second object = 50 kg.
r = distance apart, between centers = in this case it is the radius of the earth
= 6.38 x 10^6 m.
( Sorry I could not assume with the values you gave).
(Actually the force of attraction between an object on the Earth and the Earth is the weight of the object our answer should be around 500N which is from mg = 50 *10 = 500)

So F = ((6.67 * 10 ^ -11)*(5.97 x 10^24)*(50)) / (6.38 x 10^6)^2.
Punch it all up in your calculator.
F = 489. 135 N.

Remember we said it would be around 500.
So that's our answer.
F = 489. 135 N. Hurray!!

Final answer:

The force of gravitational attraction between you (of mass 50kg) and the Earth (of mass 5.97x10^24 kg) can be calculated using Newton's Universal Law of Gravitation. Substituting the respective values in the formula, the calculated force is approximately 490.5 N.

Explanation:

The force of gravitational attraction between you and the earth can be calculated using Newton's Universal Law of Gravitation. This law states that the force (F) between two masses (m1 and m2) separated by a distance (r) is given by the formula F = G*(m1*m2/r^2), where G is the gravitational constant and is approximately 6.67x10^-11 N*(m^2/kg^2).

In this case, your mass (m1) is 50 kg, Earth's mass (m2) is 5.97x10^24 kg and the radius of Earth (r) is 6.38x10^6 m. Substituting these values into the formula, we can find the force of gravitational attraction between you and the Earth.

F = (6.67x10^-11 N*(m^2/kg^2)) * ((50 kg) * (5.97x10^24 kg)) / (6.38x10^6 m)^2. After calculating the above equation, you find that F ≈ 490.5 N.

Learn more about Gravitational Force here:

brainly.com/question/18961003

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Will it take longer for a train or a car traveling at 100 mi/hr to stop

Answers

Answer;

A train will take longer time to stop compared to a car.

Explanation;

For a body in motion to stop a braking force at a given distance is required for the body to loose kinetic energy.
The the stopping distance of a car depends on the breaking force and the the mass of the moving body. The stopping distance will depend on the kinetic energy and the breaking force acting to stop the motion of a body.
The mass of a moving body determines its kinetic energy, and also determines the resultant force according to the newton seconds law of motion . Therefore, mass determines the breaking force and the stopping distance, such that a big body in motion will require more force to stop and will take a longer stopping distance and time.

It typically take longer for a heavier object to slow down therefor, a train will take more time.

Which statements about velocity are true?Check all that apply.

A. For velocity, you must have a number, a unit, and a direction.
B. The SI units for velocity are m/s2.
C. The symbol for velocity is .
D. To calculate velocity, divide the displacement by time.

Answers

just took the quiz its A C and B

A, B, and D are true for sure. It's possible that C might also be true, if we only knew what the last word or symbol is supposed to be.

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

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