How is the exposure rate generally expressed?
a. in roentgens per hour
b. in gray
c. in radiation absorbed dose
d. in microcurie

To determine the time a projectile remains in the air, calculate the initial vertical velocity using the sine of the launch angle and then apply kinematic equations to solve for time using the vertical displacement and acceleration due to gravity.

The student's question is related to the time a projectile remains in the air, which is a topic in Physics, specifically in kinematics. To find the time of flight for the projectile, we need to consider the vertical motion since the horizontal and vertical motions are independent.

Given that the initial speed of the ball is 16.0 m/s and it is thrown at a 60.0° angle, we can find the initial vertical velocity (Vy) using the sine function: Vy = 16.0 m/s * sin(60.0°).

The vertical displacement Δy for the ball when it hits the ground will be -2.00 m (negative since it's ending below the point of release). We will use the following kinematic equation for vertical displacement: Δy = Vy * t + 0.5 * g * t^2, where g is the acceleration due to gravity (-9.8 m/s^2, negative as it's directed downwards).

By substituting the known values and solving the quadratic equation for t (time), we can determine the total time the ball remains in the air.

The energy transformation of a jet plane rapidly accelerating down a runway involves the conversion of chemical energy into kinetic energy and the potential decrease in potential energy. The engines also generate sound and heat energy.

The energy transformation of a jet plane rapidly accelerating down a runway involves multiple concepts in physics. Initially, the plane's engines convert chemical energy from fuel into kinetic energy as the plane moves forward. As the plane accelerates, the kinetic energy increases, while the potential energy decreases. Finally, the plane's engines also generate sound and heat energy as a byproduct of the combustion process.

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The velocity of car 2 from the frame of reference of car 1 will be 10 mph.

The change of distance with respect to time is defined as speed. Speed is a scalar quantity. It is a time-based component. Its unit is m/sec.

The given data in the problem is

The velocity of car 1, V₁ = 20 mph south

The velocity of car 2, V₂ = 30 mph north

From the frame of reference of car 1, the velocity of car 2 will be V₁₂

From the frame of reference of car 1, the velocity of car 2 will be;

V₁₂=V₂ - V₁

V₁₂= 30 mph - 20 mph

V₁₂= 10 mph

Hence, the velocity of car 2 from the frame of reference of car 1 will be 10 mph.

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it becomes a magnet.

Final answer:

Margret traveled 50 miles to her appointment. To determine this, an equation using the relationship between time, distance, and speed was solved, taking into account that her return trip took 1/4 hour longer due to heavy traffic.

Explanation:

To solve this problem, we need to set up an equation using the concept of time, distance, and speed. Let d represent the distance to the appointment. The time taken to get to the appointment is d/50 hours, and the time taken to come back is d/40 hours. We are given that the return trip took (1/4) hours longer, which can be written as:

d/40 = d/50 + 1/4

To find the distance d, we solve this equation. Clear the fractions by multiplying everything by a common denominator, which is 200 in this case, to get:

5d = 4d + 50

This simplifies to d = 50 miles. Therefore, the distance Margret traveled to her appointment was 50 miles.

This problem is a classic example of using algebra to solve for a variable in a scenario involving average speed, and it emphasizes understanding the relationship between speed, distance, and time.

correct answer is a because that was the coreect answer on e2020

Answer:

Force=35 N

Explanation:

Given data

mass m=10.0 kg

Gravitational field E=3.50 N/kg

To find

Force

Solution

From definition of gravitational field intensity.

[tex]E_{gravitational-field }=\frac{Force}{mass}\\ E=F/m\\F=mE\\F=(10.0 kg)*(3.50 N/kg)\\F=35N[/tex]

Answer:

Metal : silver

Explanation:

It is given that,

Mass of the metal, m = 0.5 kg

Temperature, [tex]\Delta T=1\ ^0\ K[/tex]    

Heat, Q = 115 J

Heat absorbed is given by :

[tex]Q=mc\Delta T[/tex]

[tex]c=\dfrac{Q}{m\Delta T}[/tex]

Where,

c is the specific heat of the metal

[tex]c=\dfrac{115\ J}{0.5\times 1\ ^0K}[/tex]

[tex]c=230\ J/kg\ ^0K[/tex]

The metal having specific heat equals 230 J/kg °K is silver

Hence, this is the required solution.

Final answer:

To find the density of syrup added to a container, we subtract the empty container's mass from the total mass to get the syrup's mass, convert the pint volume to mL, and divide the mass by the volume, resulting in a syrup density of 1.42 g/mL.

Explanation:

The question involves determining the density of syrup by first finding the mass of the syrup alone and then using its volume in pints. The mass of the empty container is given as 115.25 g, and the total mass of the container with syrup is 182.48 g.

To find the mass of the syrup alone, we subtract the mass of the container from the total mass, which gives us 67.23 g of syrup. To convert 0.100 pint to milliliters (mL), we use the conversion rate (1 pint = 473.176 mL), resulting in 47.3176 mL of syrup. Density is mass divided by volume, hence we divide 67.23 g by 47.3176 mL to get the density of the syrup.

Density calculation:

Therefore, the density of the syrup is 1.42 g/mL.

The incorrect statement about seasons is A. Earth's proximity to the Sun does not cause the seasons; it is the tilt of Earth's axis that causes seasons. The question's primary focus is on dispelling the misconception that Earth's distance from the Sun determines seasonal changes.

The statement that is not true of the seasons is A. The Earth is closer to the sun during the summer and farther away from the sun during the winter. In fact, the Earth's distance from the Sun varies only by about 3%, which is not significant enough to cause the seasons. Moreover, during the Northern Hemisphere's winter in December, Earth is actually closest to the Sun. The seasons are instead caused by the Earth's 23.5-degree tilt on its axis, leading to varying angles and durations of sunlight exposure for different parts of the world as the Earth orbits the Sun.

The tilt causes one hemisphere to be more directly exposed to the Sun's rays, making it summer there, while the other hemisphere receives less direct sunlight and thus experiences winter. This is why the Southern and Northern Hemispheres have opposite seasons. Additionally, summer does not start on the same day in every country, and during the summer, days are indeed longer due to the tilt of the Earth.

Answer: This process absorbs energy.

Explanation:

There are two ways in which electrons can transition between energy levels:

Absorption spectra: This type of spectra is seen when an electron jumps from lower energy level to higher energy level. In this process, energy is absorbed.

Emission spectra: This type of spectra is seen when an electron jumps from higher energy level to lower energy level. In this process, energy is released in the form of photons.

So, when electron jumps from lower to higher energy level, it absorbs energy.

Answer: The correct answer is "amplitude".

Explanation:

The expression of the energy in terms of frequency is as follows;

E=hf

Here, h is Planck's constant, E is the energy and f is the frequency of the wave.

Here, the energy is directly proportional to the frequency of the wave. The energy of the wave is inversely proportional to the wavelength of the wave.

Amplitude is the maximum displacement of the particle from its equilibrium position in the vertical direction.

The amount of energy carried by a wave is directly proportional to the square of the amplitude. More the energy of the wave, more will be amplitude of the wave. Lesser the energy of the wave, lesser will be the amplitude of the wave.

Therefore, the correct option is (B).

m₁ = mass of sample of copper = m₂ = mass of sample of aluminum = 5 g

T = initial temperature of copper = initial temperature of aluminum

T₁ = final temperature of copper

T₂ = final temperature of aluminum

c₁ = specific heat of copper = 0.09 cal/g°C

c₂ = specific heat of aluminum = 0.22 cal/g°C

Since both receive same amount of heat, hence

Q₁ = Q₂

m₁ c₁ (T₁ - T) = m₂ c₂ (T₂ - T)

(5) (0.09) (T₁ - T) = (5) (0.22) (T₂ - T)

T₁ - T = (2.44)  (T₂ - T)

Change in temperature of copper = (2.44) change in temperature of aluminum

hence the correct choice is

c. The copper will get hotter than the aluminum.

Answer: c. The copper will get hotter than the aluminum.

Explanation: Specific heat capacity of a substance is the amount of heat required to raise the temperature of 1 gram of water through [tex]1^0C[/tex]

As we know that,  

[tex]Q=m\times c\times \Delta T[/tex]

m= mass

c = specific heat

[tex]\Delta T[/tex] = change in temperature

Given : [tex]Q_{Cu}=Q_{Al}[/tex]

mass of copper = mass of Aluminium= 5 g

[tex]c_{Cu}\times \Delta T_{Cu}=c_{Al}\times \Delta T_{Al}[/tex]      

Now put all the given values ,  we get

[tex]0.09\times \Delta T_{Cu}=0.22\times \Delta T_{Al}[/tex]

Thus as specific heat capacity of copper is less, the temperature change will be more as they both are at same initial temperature.

Explanation:

According to Newton's second law of motion, the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Mathematically,    Force = mass × acceleration

or,                         Acceleration = [tex]\frac{Force}{mass}[/tex]

Thus, we can conclude that in order to accelerate an object, force must be applied. The object will accelerate in the direction in which force is applied.

In order for an object to accelerate, a net force must be applied to it. The net force determines the resulting acceleration of the object. The net force may come from various sources.

According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass

F = m × a,

If an object experiences a net force, it will undergo acceleration in the direction of the net force. Acceleration is the rate of change of velocity, so the object will either speed up, slow down or change direction.

The net force required to accelerate an object may come from various sources, such as applied forces, gravitational forces, frictional forces, or any other force acting on the object. The net force determines the resulting acceleration of the object.

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Answer: The correct word for the blank is 'oscillates'

" a mechanical wave is created when a medium oscillates , or moves back and forth or up and down

Explanation:

When the matter oscillates or vibrates it transfers energy through the medium in the form of wave which termed s mechanical wave.For example: Sound wave,slinky waves, water waves are the examples of mechanical waves.

So, " a mechanical wave is created when a medium oscillates , or moves back and forth or up and down

Answer:  

Light from star would take 100 years to reach the Earth.

Explanation:

1 light year can be defined as the distance which light travels in one year in space.

1 light year = speed of light × 1 year

1 light year = 9.46 × 10¹⁵ m

A star at a distance of 1 light year means that observer on earth would see the first light from the star after 1 year.

If a star is located 100 light years from the Earth, the light from the star will reach the Earth in 100 years.

An electron is a negatively charged particle found outside the nucleus of an atom, responsible for the electrical properties and chemical behavior of atoms. Electrons orbit around the nucleus in specific energy levels or shells and carry electrical current.

An electron is a negatively charged particle that is found outside the nucleus of an atom. It is one of the fundamental particles that make up an atom and carries a unit negative charge.

Unlike protons that are found in the nucleus and carry a positive charge, electrons orbit around the nucleus in specific energy levels or shells. These negatively charged particles are responsible for the electrical properties and chemical behavior of atoms.

For example, in electrical circuits, when electrons flow through a conductor, they carry electrical current. However, it is important to note that despite being negatively charged, electrons do not carry positive charge like a proton.

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An electron is best characterized by the following description A. Negatively charged particle outside the nucleus of an atom.

To explain further, an electron is a subatomic particle with a negative charge that resides in the electron orbital, which is outside the nucleus of an atom. It carries the smallest unit of negative charge, denoted by a charge of -1.

Electrons are fundamental components of atoms and play a crucial role in chemical reactions and the flow of electricity.