carl is on vacation from school and he went to the beach for the day. he laid his towel out and got his sunblock out. he noticed a warning on the back of the aerosol can of sunblock -- it says: contents under pressure; do not heat. why does the warning advise against heating the can?

The cosmological model for the formation of the sun and the rest of our solar system is called the nebular hypothesis.

The nebular hypothesis is the idea that a spinning cloud of dust made of mostly light elements, called a nebula, flattened into a sort of protoplanetary disk and became a solar system consisting of a star with orbiting planets.

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The distance fallen by the object at the instant when its kinetic energy has doubled is 5.097m

The kinetic energy of an object is the energy possessed by the body by virtue of its motion.

The gravitational potential energy (energy due to the virtue of its position) of a body is being converted to Kinetic energy once an object falls.

Using the law of conservation of energy according to the equation:

Kinectic Energy = Potential Energy

Since PE = mgh

KE = PE = mgh

Given the following parameters

KE = 100J

m = 2kg

g = 9.81m/s²

Required

Height h

Substitute the required values into the formula

100 = 2(9.81)h

h = 100/19.62

h = 5.097m

Hence the distance fallen by the object at the instant when its kinetic energy has doubled is 5.097m

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The net force on q3 is -1.686 N, with the arrow pointing to the left.

We may compute the force exerted by q1 and q2 on q3 using Coulomb's law:

where k is Coulomb's constant, q1, q2, and q3 are particle charges, and r1 and r2 are the distances between q1 and q3, respectively.

When we substitute the provided values, we get:

The forces' negative sign implies that they point in the opposite direction as the axis's positive direction. As a result, F1 points to the left, whereas F2 points to the right.

The vector sum of F1 and F2 is the net force on q3:

Fnet = F1 + F2 = -0.056 N + (-1.686 N)

As a result, the net force on q3 is -1.686 N and the force is negative will point left.

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Answer:

1.67s

Explanation:

Given parameters:

Initial velocity  =  20m/s

Acceleration  = 6m/s²

Final velocity  = 30m/s

Unknown:

Time taken  = ?

Solution:

Acceleration is the rate of change of velocity with time. It is mathematically expressed as;

 Acceleration = \(\frac{v - u }{t}\)  

v is the final velocity

u is the initial velocity

 t is the time taken

            6  =\(\frac{30 - 20}{t}\)  

            6  = \(\frac{10}{t}\)  

              10  = 6t

              t  = 1.67s

(1.1) The deceleration of object A is - 3.6 m/s².

(1.2) The magnitude of the displacement of Object A to the left is 945 m.

(1.3) The object further to the right at 25 s is B with distance of 200 m.

(1.4) The distance covered by Object B in the last 15 seconds 870 m.

(1.5) The total distance traveled by object A is 1,050 m

(1.6) The velocity of object B 25s after it has started moving is 35.6 m/s.

(1.1) The deceleration of object A is calculated by applying the following method.

a = Δv/Δt

where;

a = (0 - 18) / ( 20 - 15)

a = - 3.6 m/s²

(1.2) The magnitude of the displacement of Object A to the left is calculated as;

Displacement = area under the curve;

D = ¹/₂ [(20s - 0s)(15s - 10s) x (18 m/s - 0 m/s)]  +  ¹/₂ (25 s - 20 s)(18 m/s - 0 m/s)

D = 900 m + 45 m

D = 945 m

(1.3) The object further to the right at 25 s is calculated as follows;

A =  18 m/s x 25 s = 450 m

B = 26 m/s x 25 s = 650 m

difference = 650 m - 450 m = 200 m

(1.4) The distance covered by Object B in the last 15 seconds of its motion is calculated as follows;

at t = 25 s, v = 26 m/s

at t = 40 s, v = 38 m/s

Δx = (40 x 38) - (25 x 26)

Δx = 870 m

(1.5) The total distance traveled by object A is calculated as follows;

between 0 to 30 s, D = 945 m + 45 m = 990 m

between 30 s to 40 s = ¹/₂(35 s - 30s)(8 m/s) + (40 s - 35 s)(8 m/s) = 60 m

total distance = 990 m + 60 m = 1,050 m

(1.6) The velocity of object B 25s after it has started moving is between 10 s and 35 s;

15 s --------> 26 m/s

35 s ------> ?

40 s -------> 38 m/s

(35 - 15)/(40 - 15) = (? - 26) / (38 - 26)

0.8 = (? - 26) / 12

? - 26 = 9.6

? = 35.6 m/s

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Assuming the applied force is exerted parallel to the floor, by Newton's second law both the net vertical and net horizontal forces would be zero:

∑ F (horizontal) = p - f = 0 … … … because the desk is pushed at a constant speed

∑ F (vertical) = n - mg = 0 … … … because the desk doesn't move up or down

where p is the magnitude of the applied force, f is the mag. of kinetic friction, n is the mag. of the normal force due to contact between the floor and desk, and mg is the weight of the desk. We have

n = mg = (100 kg) g = 980 N

and the mag. of friction is proportional to n according to

f = 0.4 n = 392 N

Then the applied force p has magnitude

p = f = 392 N

Answer:

If density is greater, the object sinks. Saturn is mainly composed of the lightest two gases known, hydrogen and helium. It is the only planet in our solar system whose density is less than water

Explanation:

Planet density are uneven they all have different density.

Mass per unit of volume is referred to as density. Although the Latin letter D can also be used, the sign most frequently used for density is. Mass divided by volume is how density is mathematically defined:

If density is greater, the object sinks. Saturn is mainly composed of the lightest two gases known, hydrogen and helium. It is the only planet in our solar system whose density is less than water

Planet density are uneven they all have different density.

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Weight of the vehicle on Earth is 6736.72 kg.

What is the weight of an object?

The weight of an object is the force exerted on it owing to gravity in science and engineering. Weight is defined as a vector quantity in certain standard textbooks, as the gravitational force exerted on the item. Others describe weight as a scalar quantity, the magnitude of gravity.

Weight on Mars = (Weight on earth/10) x 3.711

Given, weight on mars = 2500 kg

Therefore, weight on Earth = 6736.72 kg.

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Answer:

The equal and opposite force is equal to the sum of any frictional force to the product of the mass of the wagon and the acceleration of the wagon

Explanation:

Newton's third law states that for every action, or force, there is an equal and opposite reaction

The equal and opposite force = The mass of the Wagon, m × The acceleration of the wagon, a + Any frictional force present, \(F_f\)

Whereby the force with which the horse pulls the wagon = F, mathematically, we have;

The equal and opposite force = -F = m × a + \(F_f\).

Answer:

Ground pushes up on the horse’s hooves

Explanation:

khan academy

The various types of electromagnetic waves that make up the electromagnetic spectrum are arranged according to decreasing wavelength and rising frequency.

Regardless of which peak we choose to measure from, the wavelength, remains the same. Waves with longer wavelengths have less energy than those with shorter wavelengths.

The radio waves that make up the electromagnetic spectrum have the longest wavelengths. Radio waves range in frequency from 300 GHz to as low as 3 kHz, with wavelengths between 1 mm and 100 km.

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Answer:

30.95 cm

Explanation:

The focal length f, the object distance do, and the image distance di are related with the following equation:

So, replacing the values, we get:

Then, solving for di, we get:

Therefore, the image distance is 30.95 cm

Answer:

A straight line with no slope.

Answer:

C on edge 2021

Explanation:

When a ferromagnetic material is placed in an electromagnetic coil and a magnetic field is applied, the magnetic induction (B) is increased.

Therefore, the correct answer is:

(a) There is a large increase in the magnetic induction (B)

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Answer:

2.30×10³

10.3

Explanation:

The rules for significant digits are:

To write 2300.2 in three significant figures, you'll have to write it in scientific notation.

2.30×10³

To write 10.26730 in three significant figures, simply round to the tenths place.

10.3

The ciliary body is a wedge-shaped thickening in the middle layer of the eyeball that controls the shape of the lens.

The ciliary body is a section of the middle layer of the eye's wall. It is located behind the iris.  It includes a ring-shaped muscle that modifies the curvature of the lens when the eye focuses.

Additionally, it creates the transparent liquid that fills the area between the iris and the cornea. Aqueous humor is the name of this fluid in the eye.

It also contains the ciliary muscle, which modifies the lens' shape when your eyes focus on a close object.

The anterior pars plicata and the posterior pars plana are two parts of ciliary body. The anterior vitreous comes into contact with the pars plana, which creates a smooth surface. The ciliary processes, which are 70–80 radiating ridges, are produced by the pars plicata.

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Answer:

because of the gravity of the earth

Explanation:

she human activity for

Answer: left and applied force

Explanation:

Answer:

H = 1 200 km

Explanation:

Given:

M = 6.42·10²³ kg

R = 3.39·10⁶ m

V₀ = 3.00·10³ m/s

______________

H - ?

Acceleration of free fall on Mars:

g = G·M / R²

g = 6.67·10⁻¹¹·6.42·10²³/ (3.39·10⁶)² ≈ 3.73  m/s²

The maximum height above the surface that the probe reaches:

 H = V₀² / (2·g)

H = (3.00·10³)² / (2·3.73) ≈ 1 200 000 m = 1 200 km

Answer: The change in momentum is +20 kg.m/s

Explanation:

To calculate the final velocity of object, we use the first equation of motion:

\(v=u+at\)

where,

v = final velocity

u = initial velocity = 0 m/s

a = acceleration = \(10m/s^2\)

t = time = 0.5 s

Putting values in above equation, we get:

\(v=0+(10\times 0.5)\\\\v=5m/s\)

Momentum is defined as the product of the mass and velocity of an object. It is given by the equation:

\(p=mv\)

where,

p = momentum

m = mass of object = 2 kg

Let the upward velocity be positive and the downward velocity be negative

When the object is dropped, the velocity is downward

v = -5m/s

Initial momentum = \(2kg\times (-5m/s)=-10kg.m/s\)

When the object is bounced back, the velocity is upward

v = +5m/s

Final momentum = \(2kg\times (+5m/s)=10kg.m/s\)

Change in momentum = Final - Inital

Change in momentum = [10 - (-10)] = +20 kg.m/s

Hence, the change in momentum is +20 kg.m/s

A cement base is usually unnecessary beneath a composite resin restoration because composite resin materials have adhesive properties that allow them to bond directly to the tooth structure.

1. Composite resin is a tooth-colored dental material commonly used for restorations such as fillings, inlays, and onlays.

2. Composite resin materials are composed of a mixture of resin and filler particles, which give them their strength and aesthetic properties.

3. One of the key advantages of composite resin is its ability to bond directly to the tooth structure, creating a strong and durable restoration.

4. The bonding process involves applying an adhesive bonding agent to the tooth surface, which is then cured to create a micromechanical bond between the composite resin and the tooth.

5. This bonding mechanism allows the composite resin to adhere securely to the tooth, creating a tight seal and preventing leakage or microleakage between the restoration and the tooth structure.

6. Additionally, composite resin materials have improved physical properties and wear resistance compared to earlier dental materials, making them suitable for use without a cement base.

7. In contrast, traditional dental materials such as amalgam or glass ionomer cement often require a cement base for retention purposes due to their different properties and mechanisms of retention.

8. The absence of a cement base beneath a composite resin restoration also allows for a more conservative tooth preparation, preserving more of the natural tooth structure.

9. However, it is important to note that in certain cases where the tooth structure is severely compromised or additional support is needed, a cement base or other techniques may be employed in combination with composite resin restorations.

10. Overall, the adhesive properties of composite resin materials eliminate the need for a cement base in most cases, providing a reliable and aesthetic restoration while preserving tooth structure.

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They are used to see round dangerous bends

Answer:

Explanation:

Nosebleeds can be caused by being up in a very high altitude. As you climb higher, the amount of oxygen in the air decreases. This makes the air thinner and dryer, which can in turn cause the inside of your nose to crack and bleed.

The frequency of the pendulum is 0.397 Hz, which means that the pendulum completes 0.397 cycles per second. This value can also be expressed as 23 cycles per 58 seconds or 46 cycles per 116 seconds, etc.

The frequency of a wave or oscillation is defined as the number of cycles completed per unit time. In this case, we are given that a pendulum completes 23 full cycles in 58 seconds. Therefore, the frequency of the pendulum can be calculated by dividing the number of cycles by the time taken.

Frequency = Number of cycles / Time

Substituting the given values, we get:

Frequency = 23 / 58

Frequency = 0.397 Hz

Therefore, the frequency of the pendulum is 0.397 Hz, which means that the pendulum completes 0.397 cycles per second. This value can also be expressed as 23 cycles per 58 seconds or 46 cycles per 116 seconds, etc.

The period of the pendulum can be calculated by taking the reciprocal of the frequency, i.e., the time taken for one complete cycle. In this case, the period is 2.52 seconds (1 / 0.397), which means that it takes the pendulum 2.52 seconds to complete one full swing.

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The wavelength will be longer, increasing the diffraction angle.

The separation between two successive wave crests or troughs is known as a wavelength.

Here are some wavelength illustrations: Yellow Light, for instance. All visible light has a wavelength between 400 and 700 nanometers (nm).

Radio waves, light waves, and infrared (heat) waves are examples of electromagnetic radiation that flow through space in distinct patterns.

The symbol for the wavelength in the SI is often the letter m. Additionally, multiples or fractions of a metre are employed when calculating wavelength. The use of exponential powers of 10 is noteworthy when wavelengths are a significant feature.

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Answer:

Simple Response: The diffraction angle of the waves is approximately equal to the wavelength divided by the gap width. Therefore, increasing the wavelength will increase the diffraction angle.

Explanation:

Answer: it will take 15 minutes

Answer:

It will take the boy 136 hours 11 minutes.

Explanation:

35 × 35 = 1225km is the area of the square.

Now find how long it will take the boy:

1225 ÷ 9 = 136.11

Which is 136 hours 11 minutes.

Between the point of projection and the point of maximum height, the mass's mechanical energy due to air resistance changes by -245 J.

The equation y = h + V y t  g t 2 / 2 y=h+Vytgt2/2 describes the vertical distance from the ground, where g represents the acceleration of gravity.

The work-energy concept may be used to compute the modification in mechanical energy of the mass brought on by air resistance:

ΔE = W_net

At the point of projection, the mechanical energy of the mass is:

E_i = 1/2 * m * v_i²

where m is the mass of the object, and v_i is the initial velocity.

E_i = 1/2 * 2.0 kg * (35 m/s)² = 1225 J

At the maximum height, the mass has zero velocity, so its mechanical energy is entirely potential energy:

E_f = m * g * h

E_f = 2.0 kg * 9.8 m/s² * 50 m = 980 J

The net work done on the mass is equal to the difference between its initial and final mechanical energies:

W_net = E_f - E_i

= 980 J - 1225 J

= -245 J

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