A ray of light indexes on a smooth surface and makes an angle of 10° with the surface.
What is the angle of incidence?
a) 10° b) 20° c) 50° d) 40° e) 80°

Answer:The disturbance created by a source of sound in the medium travels through the medium and not the particles of the medium

Explanation:i hope this is right

Three uncertain digits are present when a quantity is expressed in significant figures.

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Answer:

B.d

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Answer:

D. b

Explanation:

the endpoint of vector b is at 3, which means the length is 3

Answer:

67.56kg

Explanation:

Fapp+mg = ma

Fapp= applied force

mg = reactional force

g = acceleration due to gravity

Where g = 9.8m/s^2 a= 5 m/s2, Fapp= 1000N.

1000N = ma + mg

1000N = m( a+g )

1000N = m ( 5+9.8)

1000N = m×14.8

m = 1000÷14.8

m = 67.56kg.

Hence the mass of the wagon will be 67.56kg

Answer

Its PO

Explanation:

I got it right on Edge.

Answer:

1.)6.1

Explanation:

sorry po tinatamad po ka akong mag basa

Answer:

Below

Explanation:

I  believe that equation is   v = sqrt ( 19.6 h )      

 when h = 21 :

    v = sqrt (19.6  * 21) = 20.3 m/s

When we classify different things into living and non-living categories, we look at specific characteristics that allow us to differentiate between the two.

The following are some of the characteristics used to classify things into living and non-living categories:

Living Things A living thing is an organism that has life and can perform some specific functions. The following are some of the characteristics of living things:

Responds to Stimuli: Living things can respond to stimuli such as light, heat, or sound. For example, if you make a loud noise, a person will respond by covering their ears.

Uses energy: living things need energy to perform their functions. They get energy from the food they eat or from the sunlight they absorb.

Grows and Develops: Living things grow and develop. For example, when a baby is born, it grows into an adult.

Reproduces: Living things reproduce. They can have babies or lay eggs. For example, a female cat can have kittens.

Non-Living Things:

Non-living things are things that do not have life.

The following are some of the characteristics of non-living things:

Do not respond to stimuli. Non-living things cannot respond to stimuli. For example, a rock will not move when you shout at it.

Does not grow or develop; non-living things do not grow or develop. For example, a chair will not grow into a table.

Does not reproduce; non-living things do not reproduce. For example, a book will not have babies or lay eggs.

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Electrons are one of the constituents of atoms. It is negatively charged particles and the atom has the same number of protons and electrons.

Matter is made up of atoms. Atoms are made up of protons, electrons, and neutrons. The protons are positively charged particles, electrons are negatively charged particles, and neutrons are neutrally charged particles. Protons and neutrons are present inside the atoms from the nucleus. The electrons are revolving around the nucleus due to attractive force.

The characteristics of the electrons are: Electrons are identified by J.J Thomson by using cathode rays. The electrons are negatively charged particles. The mass of an electron is 9.11×10⁻³¹Kg and the charge of an electron is 1.6×10⁻¹⁹C. They are the fundamental block of all atoms. Cathode beams are the source of electrons.

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The thermal energy will be transferred from the air to the surface. Hence, the answer is false.

Thermal energy can be transferred from higher temperatures to lower temperatures. It is obey the second law of thermodynamics

"At a very microscopic level, it simply says that if you have a system that is isolated, any natural process in that system progresses in the direction of increasing disorder, or entropy, of the system."

It means that heat energy transferred from the higher temperature and the lower temperature states will absorb heat energy from the surrounding. The thermal energy will be transferred through conduction, convection, or radiation.

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The 1 repetition maximum (1 RM) refers to the maximum amount of resistance you can move one time. Option C is correct.

The 1 repetition maximum (1 RM) is a measure of the maximum amount of resistance an individual can lift in a single repetition of a given exercise. It is commonly used in strength training to determine an individual's level of strength and to develop an appropriate training program.

The 1 RM is typically determined by gradually increasing the resistance until the individual can no longer lift the weight with proper form. This maximum amount of resistance lifted is then recorded as the 1 RM. By using the 1 RM as a benchmark, individuals can track their progress over time and adjust their training program accordingly to continue making gains in strength. Hence, option C is correct.

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The magnitude of the force caused by air resistance, also known as drag force.

Depends on several factors, including the velocity of the object, its surface area, the air density, and the drag coefficient. The equation for drag force can be represented as follows:

\(F_d = 0.5\times C_d \times A \times p\times v^2\)

where:

F_d is the drag force in Newtons (N)

C_d is the drag coefficient, which depends on the shape of the object and its surface roughness

A is the reference area of the object in square meters (m^2)

ρ is the air density in kilograms per cubic meter (kg/m^3)

v is the velocity of the object in meters per second (m/s)

Since you mentioned that the car's velocity is constant, you can use the velocity value to calculate the drag force. However, to obtain an accurate result, you would also need to know the other variables (C_d, A, and ρ) for the specific car in question.

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According to the question it took the plane 675 seconds (11 minutes and 15 seconds) to travel 3.2 km.

Travel is the act of moving from one place to another, either for leisure or business purposes. It is often associated with exploration and discovery, as well as the opportunity to experience new cultures, cuisines, and landscapes.

The velocity of the plane relative to the ground is the vector sum of the air velocity (3.0 m/s [E]) and the wind velocity (1.75 m/s [25° W of S]).

The vector sum can be calculated using the Law of Cosines and the Law of Sines.

Using the Law of Cosines, we can calculate the magnitude of the vector sum:

|v| = √(3.0 m/s)2 + (1.75 m/s)2 - 2(3.0 m/s)(1.75 m/s)cos(25°)

|v| = 4.73 m/s

Using the Law of Sines, we can calculate the angle of the vector sum:

sin(θ) = (1.75 m/s)sin(25°) / 4.73 m/s

θ = 20.9°

Therefore, the velocity of the plane relative to the ground is 4.73 m/s [20.9° W of S].

To find the time it took the plane to travel 3.2 km, we can use the equation:

t = d / v

where t is the time in seconds, d is the distance in meters, and v is the velocity in m/s.

t = 3200 m / 4.73 m/s

t = 675 s

Therefore, it took the plane 675 seconds (11 minutes and 15 seconds) to travel 3.2 km.

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The devices used by mechanical cooling thermostats to turn off early enough to prevent system overshoot or temperatures below the thermostat set point are called anticipators.

An anticipator is a small resistor that operates like a little heater inside your thermostat. The anticipator is the device that controls the duration of each heating cycle in old-style thermostats. This component essentially informs the heating and cooling system to cut off early. The mechanical thermostat anticipator is made up of two parts: the thermostat switch and the heat anticipator. When the thermostat switch turns off, the anticipator's heater stays on for a short period longer, avoiding overheating or undercooling of the controlled space.

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Answer:

Isaac Newton

Explanation:

Newton's laws of motion, three statements describing the relations between the forces acting on a body and the motion of the body.

The calories needed to change 10 grams of ice at zero degrees C to steam at 100 degrees C is 7200 (Option C).

To calculate the calories needed to change 10 grams of ice at zero degrees C to steam at 100 degrees C, we must:

1. Heat needed to melt ice (Q1):

Q1 = mass × heat of fusion

2. Heat needed to raise the temperature of water from 0 to 100 degrees C (Q2):

Q2 = mass × specific heat of water × temperature change

3. Heat needed to change water into steam (Q3):

Q3 = mass × heat of vaporization

Total heat required (Q_total) = Q1 + Q2 + Q3

For 10 grams of ice:

Q1 = 10g × 80 cal/g = 800 cal

Q2 = 10g × 1 cal/g°C × 100°C = 1000 cal

Q3 = 10g × 540 cal/g = 5400 cal

Q_total = 800 + 1000 + 5400 = 7200 cal

So, the calories needed to change 10 grams of ice at zero degrees C to steam at 100 degrees C is 7200.

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Explanation:

KE = ½ mv²

130,048 J = ½ m (16 m/s)²

m = 1016 kg

Answer:

40m/s

Explanation:

momentum = mass * velocity

momentum / mass = velocity

2400kg*m/s / 60kg = 40m/s

Answer:

HELIOS- The god of the sun in

HAZMAT-Hazardous materials

NIRSpec- Near Infrared Spectrograph

Explanation:

The acronyms will be:

HAZMAT is an abbreviation for “hazardous material that is the substances in quantities or forms that may pose a reasonable risk to health, property, or the environment.

Near-infrared spectroscopy (NIRS) is a brain imaging method that measures light absorbance to calculate oxy-hemoglobin (oxy-HB) and deoxy-hemoglobin.

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The unknown variables in the model equation for ball's motion include vertical distance traveled by the ball which is 31.86 m and the final velocity of the ball which is 25 m/s.

The given parameter;

The equations that model the motion of the ball is given as follows;

\(h = v_0_y + \frac{1}{2} gt^2\)

\(v_f = v_0_y + gt\)

All the unknown variables in the equations include;

The vertical distance traveled by the ball is calculated as follows;

\(h = \frac{1}{2} gt^2\\\\h = 0.5 \times 9.8 \times 2.55^2\\\\h = 31.86 \ m\)

The final velocity of the ball is calculated as follows;

\(v_f = 0 + 9.8(2.55)\\\\v_f = 25 \ m/s\)

Thus, the unknown variables in the model equation for ball's motion include vertical distance traveled by the ball which is 31.86 m and the final velocity of the ball which is 25 m/s.

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Answer:

answer is c

Explanation:

Answer:

0.45  [m/s²].

Explanation:

1) formula of the required acceleration is (V-final velocity, V₀-initial velocity, t-elapsed time):

\(a=\frac{V-V_0}{t};\)

2) according to the formula above:

a=(12-3)/20=0.45 [m/s²].

The frequency that the driver of the car hears the siren of an emergency vehicle traveling at 45 m/s and approaching a car heading in the same direction at a speed of 24 m/s is 538 Hz.

Doppler effect refers to a shift in the frequency of sound waves or light waves as they move toward or away from an observer. When the vehicle moves towards us, the sound waves are compressed, and their frequency increases, resulting in a higher pitch.

When the vehicle moves away from us, the sound waves are stretched out, and their frequency decreases, resulting in a lower pitch. This effect is also applicable to light waves.

The formula for calculating the Doppler effect is: f'= f(v±vᵒ)/(v±vᵰ), where,• f' is the frequency of the observed wave,• f is the frequency of the emitted wave,• v is the speed of the wave in the medium,• vᵒ is the speed of the observer relative to the medium,• vᵰ is the speed of the source relative to the medium.

In this case, the driver of the car hears the siren, which is moving towards him, hence the formula is:

f'= f(v+vᵒ)/(v±vᵰ)

Substituting the values of f, v, vᵒ, and

vᵰ,f' = 650(343+24)/(343-45)f'

= 538 Hz

Therefore, the driver of the car hears the siren at a frequency of 538 Hz.

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When a fragment of bone containing carbon-14 isotopes of the element carbon is discovered during an archaeological dig, and it is estimated to be approximately 23,000 years old, one can calculate the proportion of the carbon-14 isotopes that remains.

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Answer:

Since the energy goes up as the frequency increases, the energy is directly proportional to the frequency. Because frequency and wavelength are related by a constant (c) the energy can also be written in terms of wavelength: E = h · c / λ. When the energy increases the wavelength decreases and vice versa.

Figure 1 shows a 5.4 N force pushing two gliders along an air track. The 160 g spring between the gliders is compressed. The spring is firmly attached to the gliders and does not sag. This situation demonstrates Hooke’s Law, which states that the force required to compress a spring is directly proportional to the amount of displacement of the spring. In this case, the 5.4 N force is pushing the gliders towards each other, compressing the spring and causing a displacement. As Hooke's Law states, the greater the force used to compress the spring, the greater the displacement will be.

The stiffness of the spring in this situation would be determined by the spring constant, which can be calculated using the formula F = -kx. The spring constant can be calculated by using the displacement of the spring.

When the 5.4 N force is applied, the kinetic energy of the gliders is converted into potential energy, which is stored in the compressed spring. When the force is removed, the potential energy is converted back into kinetic energy and the gliders move away from each other.

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Aslaam 3lekm m3akm yaseen my 8nat alninkm

Answer:

77N

Explanation:

Since we are not told what to find, we can as well look for the net force acting on the ball.

According Newton's second law;

F = mass × acceleration

Given

Mass = 3.5kg

Acceleration = 22m/s²

Net force F = 3.5×22

F = 35/10×22

F = 7/2×22

F = 7×11

F =77N

Hence the magnitude of force required is 77N

Answer:

Explanation:

3.011 x 10^24 atoms

Answer:

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