Hich type of electromagnetic waves are dangerous enough to be used to kill cancerous cells? gamma rays visible light infrared light microwaves

Answer:

the answer is B.

Explanation:

The ball that is thrown straight up has more kinetic energy and more speed than the ball that is thrown straight down. Both balls have the same kinetic energy and speed.

The kinetic energy of a body can be determined as the energy of a moving physical system because of its motion. Work has to be done on an object to change its kinetic energy.

The kinetic energy of the moving system can be expressed as K.E. = ½mv²  where ‘m’ is mass while ‘v’ is the velocity of the object.

The potential Energy of the physical system can be described as the energy stored due to its position. The mathematical formula for the calculation of the potential energy can be expressed in the form of P.E = m×g×h where ‘g’ is the gravitational acceleration, ‘m’ is the mass and ‘h’ is the height in meters

When two identical balls are thrown from a cliff, each with the same speed. One ball is thrown straight up, and the other ball is straight down. Both balls will have the same kinetic energy as well as speed.

Learn more about kinetic energy and potential energy, here:

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Answer:

v = 1.63 m/s

Explanation:

Given that,

The mass of a car, m = 1500 kg

The kinetic energy of a car, K = 2004 m/s

We need to find the speed of a car. The formula for the speed of a car is given by :

[tex]K=\dfrac{1}{2}mv^2\\\\v=\sqrt{\dfrac{2K}{m}} \\\\v=\sqrt{\dfrac{2\times 2004}{1500}} \\\\v=1.63\ m/s[/tex]

So, the speed of the car is equal to 1.63 m/s.

Answer:taking my points !

Explanation:

Answer: (d)

Explanation:

Given

Mass of the first ram [tex]m_1=49\ kg[/tex]

The velocity of this ram is [tex]v_1=-7\ m/s[/tex]

Mass of the second ram [tex]m_2=52\ kg[/tex]

The velocity of this ram [tex]v_2=9\ m/s[/tex]

They combined after the collision

Conserving the momentum

[tex]\Rightarrow m_1v_1+m_2v_2=(m_1+m_2)v\\\Rightarrow 49\times (-7)+52\times (9)=(52+49)v\\\Rightarrow v=\dfrac{125}{101}\ m/s \quad[\text{east}][/tex]

Momentum after the collision will be

[tex]\Rightarrow 101\times \dfrac{125}{101}=125\ kg-m/s\ \text{East}[/tex]

Therefore, option (d) is correct

Answer:

Although the wave slows down, its frequency remains the same, due to the fact that its wavelength is shorter. When waves travel from one medium to another the frequency never changes.

Answer:

a/ oscillating charges

Answer:

(a) It is a destructive interference

(b) The places at which destructive interference occur on the line between the two in-phase sources, are 1.07798 m before and after the two sources

Explanation:

(a) The given parameters are;

The distance between the two in-phase sources, d = 3.50 m

The type of waves produced by the two sources = identical waves

The wavelength of the waves produced by the two sources, λ = 5.96 m

For constructive interference, we have;

d·sin(θ) = m·λ

Where, m = 0, 1, -1, 2, -2, ...

For destructive interference, we have;

[tex]d \cdot sin(\theta) = \left(m + \dfrac{1}{2} \right) \cdot \lambda[/tex]

d·sin(θ) = Δl =

Where, m = 0, 1, -1, 2, -2, ...

Therefore, given that λ > d, for constructive interference

sin(θ) = m·λ/d > 1 for m > 0 which is invalid as the maximum value for sin(θ) = 1

Therefore, the possible interference is destructive interference

(b) For destructive interference, when m = 0, we have;

[tex]3.5 \times sin(\theta) = \left(0 + \dfrac{1}{2} \right) \times 5.96[/tex]

∴ sin(θ) = (5.96/2)/3.5

θ = arcsin((5.96/2)/3.5)

By trigonometry, we have;

tan(θ) = (d/2)/l

Where

l = The location along the line

∴ l = (d/2)/(tan(θ))

By substitution, we have;

l = (3.5/2)/(tan(arcsin((5.96/2)/3.5))) = 1.07798

Therefore, the two locations along the line where there is a destructive are 1.07798 m along the line before and after the two in-phase sources.

Answer:

Tendons: Tendons are cord-like, strong, inelastic structures that join skeletal muscles to bones

ligaments: Ligaments are elastic structures which connect bones to bones in joints.

Explanation:

Answer:

The northern lights, one of several astronomical phenomena called polar lights (aurora Polaris), are shafts or curtains of colored light visible on occasion in the night sky.

Explanation:

Answer:

Angle of incidence. = Angle of reflection

0° = 0°

30°. = 30°

42°. =. 42°

60°. =. 60°

90°. =. 90°

angle of incidence is always equal to angle of reflection on plane surface

Hope it helps

Answer:They have 10

Explanation:

Answer:

1. True - gravity affects the y motion

2. False - x-coordinates affect the horizontal motion

3. y because gravity affects motion in  the y-direction

4. x generally no external forces act in the x direction and hence no acceleration in the x direction

Answer:

The formula for calculating Density is:

= Mass / Volume

From this formula, we can say that the relationship between Mass and Density is a direct one. In other words, if mass is increasing - all else being equal - then density will increase as well.

If mass however was decreasing, density would have to decrease as well.

For example, assume 3 bricks have masses of 5kg, 10kg and 15kg. Also assume that the bricks all have the same volume of 5 m³.

Density of 5kg brick = 5 / 5 = 1 kg/m³

Density of 10kg brick = 10 / 5 = 2kg / m³

Density of 15kg brick = 15 / 5 = 3 kg /m³

Notice how density increases as mass increases and decreases when mass decreases.

Answer:

[tex]\dfrac{dE}{dt} \approx 2.261 \overline {36} \times 10^{12} \ V/ms[/tex]

Explanation:

The parameters given in the question are;

The magnitude of the displacement current density between the plates of a parallel-plate capacitor, J = 19.9 A/m²

We have;

[tex]i_d = \epsilon _0 \times \dfrac{d \Phi_E}{dt} =\epsilon _0 \times A \times \dfrac{d E}{dt}[/tex]

Therefore;

[tex]\therefore \dfrac{dE}{dt} =\dfrac{i_d}{\epsilon _0 \cdot A} =\dfrac{J}{\epsilon_0} = \dfrac{19.9}{8.8 \times 10^{-12}} \approx 2.261 \overline {36} \times 10^{12}[/tex]

Therefore;

[tex]\therefore \dfrac{dE}{dt} \approx 2.261 \overline {36} \times 10^{12} \ V/ms[/tex]

Answer:

Option A

Explanation:

Nonverbal communications are ambiguous because some times the face expressions (non verbal signals – Sad face or sitting alone gesture of Alejandro) and the verbal signals (communication between Roark and Alejandro) do not match or contradict each other. Some people prefer to believe on their interpretations of the nonverbal  signals as compared to that of the verbal signals

Hence, option A is correct.

Answer: 28.4

Explanation:

F=MA

F=(7.1)(4)

F= 28.4 N

Answer:

B

Explanation:

The Southern Hemisphere reflects a tremendous amount of radiation during the December solstice.

Northern Hemisphere receives more of the Sun’s thermal energy than the Southern Hemisphere. in the situation when the North Pole is tilted toward the Sun.

One of the most important renewable energy sources is solar thermal energy. Solar thermal systems transform solar energy into heat.

Which may be used directly or converted into electricity for use in any application that can be served by conventional power.

The Northern Hemisphere is located well above the Equator, whilst the Southern Hemisphere is located below it.

The hemispheres include distinct quantities of land, ocean, and sea, as well as varied populations and climate patterns.

When the North Pole is tilted toward the Sun the Northern Hemisphere receives more of the Sun’s thermal energy than the Southern Hemisphere.

Hence option b is correct.

To learn more about the Sun’s thermal energy refer to the link;

https://brainly.com/question/24267059

Answer:

Explained below

Explanation:

1) The human arm: This is a type of simple machine called "Lever". In this type of machine, the elbow acts as the fulcrum, the palm serves as the load because that's where we place the load we want to carry. While the inner part of the arm which is the inner part of the elbow represents the effort because that is the joint we mover when making use of our arms.

2) Pulleys: An example of this in the human body is the knee cap where the direction of an applied force is changed. Thus means as it is in motion, it alters the direction for which the quadriceps tendon pulls on the tibia.

3) wheel and axle: An example of this in the human body is the lateral rotation of the shoulder joint medial. The humerus which is the bone between the shoulder and elbow will act as the axle while the rotator will be the will because when it is rotated a little bit, the humerus will move along with it.

Answer:

Explanation:

The more aerodynamic a vehicle is the less wind resistance there is meaning there is better gas mileage because it dont have to push so hard against wind and it also helps with the eye appeal

Explanation:

Latent heat of evaporation is the heat required  to change water to vapor at the same temperature boiling temperature.(100°C)

That water turns into vapor  when heated at temperature more than 100°C without any increase in temperature.

that is latent heat of vaporization Q  = mL

Answer:

1. Amplitude.

2. Rarefaction.

3. Wavelength.

4. Compression.

Explanation:

Sound are mechanical waves that are highly dependent on matter for their propagation and transmission. Some of the properties of sound waves as it travels through a medium such as solid, liquid and gas includes the following;

1. Amplitude: the density of the medium's particles at the compressions of the waves.

2. Rarefaction: the part of a wave where the particles of the medium are farther apart. This ultimately implies that, it is part of a longitudinal wave in which the particles that make up the matter for the movement of the wave are separated by a greater distance.

3. Wavelength: the distance between compressions or rarefactions i.e the distance between two successive compressions or refractions.

4. Compression: the part of a wave where the particles of the medium are closer together. This ultimately implies that, it is part of a longitudinal wave in which the particles that make up the matter for the movement of the wave are closer together.

Answer:

here is the answers .......

Answer:

The right option is;

d) Both technicians A and B

Explanation:

High-intensity discharge (HID) headlights is an electrical gas-discharge light that gives a very bright light when an arc is formed between the tungsten electrodes that have a transparent or translucent housing

The light is ideal for night driving due to its brightness and appear to have a bluish tint at night although the light produced by HID headlight is actually more similar to Sunlight around noon

A turn signal bulb is a flashing light indicator that shows that a vehicle is about to turn or change lanes

An issue with the wiring, a broken connection at the bulb socket or a burnt bulb can result in a condition of "no turn signal" in which the turn signal stops flashing or blinking. Therefore both technicians A and B are correct.

Answer:

opposite charges.

1. two Styrofoam.

2. pieces of glitter.

3. balloon moves away from glass rod

like charges

1. two sweaters cling

2. balloons stick to wall

3. stream of water bends

Answer:

B. underwater mountain range

Answer:

an underwater mountain range

Answer:

Mechanical energy = 35 Joules

Explanation:

Energy can be defined as the ability (capacity) to do work. The two (2) main types of energy are;

a. Potential energy (P.E): it is an energy possessed by an object or body due to its position above the earth.

b. Kinetic energy (K.E): it is an energy possessed by an object or body due to its motion.

Furthermore, the mechanical energy of a physical object or body is the sum of the potential energy and kinetic energy possessed by the object or body.

Mathematically, it is given by the formula;

Mechanical energy = P.E + K.E

Given the following data;

Potential energy = 15 J

Kinetic energy = 20 J

To find the mechanical energy;

Mechanical energy = P.E + K.E

Mechanical energy = 15 + 20

Mechanical energy = 35 Joules

Answer:

Mechanical energy = 35 Joules

Explanation:

Answer:

Specific heat capacity of silver metal = 0.08184 J/kg°C

Explanation:

Given:

Mass of silver metal = 32 kg

Change in thermal energy = 55 J

Change in temperature = 21°C

Find:

Specific heat capacity of silver metal

Computation:

Using Specific heat capacity formula

C = ΔE / mΔT

where;

C = Specific heat capacity

ΔE = Change in thermal energy

m = Mass

ΔT = Change in temperature

C = (55) / (32)(21)

Specific heat capacity of silver metal = 55 / 672

Specific heat capacity of silver metal = 0.08184 J/kg°C

Answer:

the Sun is a circle in the sky and that creates a penumbra

Explanation:

A penumbra is basically a lighter and hazy outer part of the shadow. It is the partially shaded portion of the outer region of a shadow that is cast by an opaque object.

In the context, as the distance from the hand to the surface of the ground increases on a sunny day, the shadow of the hand that falls on the ground becomes fuzzier because the sun is an opaque object in the sky and it creates a penumbra which makes the shadow of the hand on the ground fuzzier as the distance is increased.

Answer:

D

Explanation:

Answer:

D.

It reduces the rate at which electrons flow.

Answer:

sun, jupiter, earth, moon

Explanation:

how big they are

Answer:

sun, jupiter, earth, moon. sun

Explanation:

The sun would have the biggest gravity because it is the massiest.

Based on the mass of each planet, this is the correct answer.