How might the fossil evidence of plants be related to the extinction of humans on earth

Answer:

Capillary Action.

Explanation:

Capillary action is the ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.

Acceleration is the rate at which an object's velocity with respect to time changes. They are vector quantities, accelerations. The direction of the net force applied on the item determines the object's acceleration.

A ball is tossed at an angle. It moves in an arc, reaches its highest point, and then falls in an arc back to the ground. During the ball’s flight, what can be said about the direction of the acceleration?

The speed of the ball is zero when it is at its highest point. This means that air resistance is not an issue.

What factors are at action there? only one force exists; that is gravity.

How much acceleration is produced by the force of gravity? Other respondents said that the acceleration would be nil.

That is untrue.

There is no velocity. Since the ball is not moving at that time, if there were no acceleration, it would remain immobile and hang in the air at the same location continuously. If the acceleration were zero, the speed would be constant.

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Decrease in potential difference causes decrease in potential energy.

A dielectric produces an internal electric field when it is exposed to an electric field because the dielectric is polarized. The potential difference between the plates is caused by the internal electric field within the dielectric, which is in the opposite direction of the field between the plates of the capacitor. As a result, the effective electric field between the plates of the capacitor diminishes.

E = ΔV/Δr

Where, Δr = distance between plates, which is constant

Potential energy of a capacitor is;

U = (1/2)qΔV

Where, Charge is constant .

Therefore, potential energy U likewise drops as a result of the potential difference V being smaller.

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Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 730 × 20

We have the final answer as

Hope this helps you

An object is placed along the axis of a concave mirror halfway between its focus and center of curvature. The image is formed at a distance f from the concave mirror.

The given mirror is a concave mirror. The object is placed at a distance, u = (R/2), from the concave mirror. Here, R = 2f (given). The magnification produced by the concave mirror is given by the relation, m = (-v/u)

For concave mirror, f is negative, (f = -R/2 = -R/2 = -2f/2 = -f)u = + R/2v = -f. By using the mirror formula,1/f = 1/v + 1/u we get, 1/f = 1/-f + 2/R we get, 1/f = -1/f + 2/2ff = 2ff = 2(R/2) ƒ = R = 2f

So, the image is formed at the same distance (R/2) from the concave mirror as the object is placed from the concave mirror. So, the distance of the image from the mirror is R/2 = 2f/2 = f

Hence, the image is formed at a distance f from the concave mirror.

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Please find attached photograph for your answer. Do comment whether it is useful or not.

Answer:

Beth went back toward her origin

Explanation:

Answer:

B

Explanation:

Hope this helps :)

Answer:

answer https:/

Explanation:

apparatus.com

The number of frames between 140 and 243 is 103. Since each frame is equivalent to 24 seconds, multiply 103 by 24s to find the time elapsed:

Assuming constant acceleration, a the distance d traveled by an object starting at rest during a time t is:

Isolate a from the equation and replace d=56m and t=2472s to find the acceleration the shuttle:

The ratio of the tangential speed of a point on the rim to the tangential speed of a point halfway between the center and the rim is 2.

The correct option is B.

The wheel's angular velocity The rate at which the angular displacement changes over time is known as the wheel's angular velocity. Because the angular velocity is constant, a point just on rim will have constant tangential velocity.

The angular velocity of a body refers to the pace at which it revolves or circumambulates an axle. Sometimes, the Greek letter omega symbolizes angular velocity. Due to the fact that it is expressed as an angle every unit of time, the angular velocity in the SI was measured in radians per second.

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Answer:

Approximately \(1.5\; {\rm s}\).

(Assumptions: \(g = 9.81\; {\rm m\cdot s^{-2}}\); air resistance on the volleyball is negligible.)

Explanation:

Under the assumptions, acceleration of the volleyball would be \(a = (-g) = (-9.81)\; {\rm m\cdot s^{-2}}\) during the entire flight. (This value is negative since the ball is accelerating downwards- toward the ground.)

By the time the volleyball hits the ground, the volleyball would be at a position \(2.0\; {\rm m}\) below where it was launched. In other words, the (vertical) displacement of the volleyball during the entire flight would be \(x = (-2.0)\; {\rm m}\). (Negative since the ball is below where it was launched.)

Apply the SUVAT equation \((v^{2} - u^{2}) = 2\, a\, x\) to find the velocity of the volleyball right before hitting the ground. In this equation:

Rearrange this equation and solve for the velocity right before landing, \(v\). Note that because \(v\!\) is raised to the power of \(2\) in \((v^{2} - u^{2}) = 2\, a\, x\), both \(v = \sqrt{u^{2} + 2\, a\, x}\) and \(v = -\sqrt{u^{2} + 2\, a\, x}\) could satisfy this equation. However, \(v\!\!\) needs to be negative since the volleyball would be travelling downwards before reaching the ground.

Therefore, right before reaching the ground, velocity of the volleyball would be:

\(\begin{aligned} v &= -\sqrt{u^{2} + 2\, a\, x \\ &= -\sqrt{(6.0)^{2} + 2\, (-9.81)\, (-2.0)} \; {\rm m\cdot s^{-1}} \\ &\approx (-8.67)\; {\rm m\cdot s^{-1}}\end{aligned}\).

In other words, velocity of this volleyball has changed from \(u = 6.0\; {\rm m\cdot s^{-1}}\) (upwards) to \(v \approx (-8.67)\; {\rm m\cdot s^{-1}}\) (downwards) during this flight. Divide the change in the velocity \((v - u)\) by the rate of change in velocity \(a = (-9.81)\; {\rm m \cdot s^{-2}}\) to find the duration of this flight:

\(\begin{aligned}t &= \frac{v - u}{a} \\ &\approx \frac{(-8.67) - 6.0}{(-9.81)}\; {\rm s} \\ &\approx 1.5\; {\rm s}\end{aligned}\).

Not the place for this but yesterday I ate a clock, it was very time consuming.

What is brown and sticky

A STICK GET YOUR MIND OUT OF THE GUTTER

Answer:

C

Explanation:

Apply the uniform acceleration equation \(v^{2} = u^{2} +2as\)

v: Final velocity (When the stone reaches its maximum height)

u: Initial velocity (The velocity of the stone at the instance when it is thrown)

a: Acceleration due to gravity

s: Displacement of the stone

Take \(v=0m/s\) since the stone is momentarily at rest when it reaches its maximum height.

Take \(a = -9.81 m/s^2\), the negative sign indicates the stone is decelerating due to gravity.

Take \(s=10m\) as stated in the question.

\(0^2=u^2+2(-9.81)(10)\)

\(196.2=u^2\)

\(u=\sqrt{196.2}\)

\(u=14.00714104m/s\)

Therefore, the closest answer is C (\(14m/s\))

Answer:

The traffic light pulling upward on earth with a 1500 N force.

Explanation:

Note that rip currents are caused by "the flow of backwash from the beach" (Option C)

A rip current is a particular type of water stream that can happen close to beaches with breaking waves. It is frequently referred to as just a rip. Unlike a river flowing out to sea, a rip is a forceful, constrained, and narrow channel of water that travels immediately away from the beach, cutting between the lines of breaking waves.

The movement of backwash from the shore is what generates rip currents. A current may drive swimmers away from the coast and out to sea when waves break on the shore and the water flows back into the ocean. The flow of backwash from the shore is what causes this, which is referred to as a rip current.

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The tension, p, in the cable needed to give the 105-lb block a steady acceleration of 7 ft/sec2 up the incline is 164.375 lbs.

To solve this, use the equation for acceleration due to gravity:
a = g*sin(theta) - (T/m)
Where:
a = the steady acceleration of 7 ft/sec2
g = acceleration due to gravity (32.2 ft/sec2)
theta = the incline angle
T = the tension in the cable
m = the mass of the block (105 lbs)
Solving for T yields:
T = m*(a + g*sin(theta))
Inserting the given values yields:
T = 105 lbs * (7 ft/sec2 + 32.2 ft/sec2*sin(theta))
T = 164.375 lbs

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true

Explanation:

this is because melting point and boiling point decreases down the group because they are held together by attractions between positive nuclei and delocalised electrons

Answer:

If you meant the Periodic Table it's the alkaline-earth metal

beryllium (Be)

magnesium (Mg)

calcium (Ca)

strontium (Sr)

barium (Ba)

radium (Ra)

Explanation:

Answer: 1h

Explanation:

Answer:

A. A motor

Explanation:

Answer:

Explanation:

In this problem we are required to find the potential energy possessed by the television

Given data

mass of television m = 15 kg

height  added above the ground, h= 1-0.3 = 0.7 m

acceleration due to gravity g = 9.81 m/s^2

apply the formula for potential energy we have

P.E= m*g*h

P.E = 15*9.81*0.7 = 103 Joules

Answer:

Count the number of hydrogen and oxygen atoms on each side of the arrow.

Explanation:

Answer: Electromagnetic radiation, such as solar flares and other forms of radiation in space, can disrupt communication tools on a spacecraft in several ways.

First of all, it can obstruct radio signals that the spacecraft uses to connect with Earth, resulting in a signal loss or a decline in the signal's quality. When the radiation disrupts the amplifiers and receivers, which are electronics that process the signals, this can occur.

The spacecraft's computer memory may experience single-event upsets (SEUs) as a result of electromagnetic radiation. A high-energy particle striking a memory cell results in a bit flip and a SEU, which can destroy data, cause software to crash, or create other issues.

The spacecraft's solar panels and other electrical components are susceptible to harm from electromagnetic radiation, which might impair power and communication.

Spacecraft designers frequently use shielding materials and redundant communication systems to reduce the impacts of electromagnetic radiation and make sure the spacecraft can keep operating even if one system fails.

Explanation:

Answer:

We can use Coulomb's law to solve this problem:

F = k * q1 * q2 / r^2

where F is the force between the two charges, k is Coulomb's constant (k = 9 x 10^9 N m^2 / C^2), q1 and q2 are the magnitudes of the charges, and r is the distance between them.

We know the force F, the distance r, and the magnitude of one of the charges q1. We can rearrange the equation to solve for the magnitude of the other charge q2:

q2 = F * r^2 / (k * q1)

Substituting the values we have:

q2 = (250 N) * (0.15 m)^2 / (9 x 10^9 N m^2 / C^2 * 6.5 x 10^-5 C)

Simplifying:

q2 = 8.65 x 10^5 C

Therefore, the magnitude of the other charge is 8.65 x 10^5 C.

Answer:

its ealstic.

Explanation:

Because the change in velocity is less in an inelastic collision, the acceleration is also less in an inelastic collision.

The Nebular theory explains the formation of our solar system from a mass of gas, ice, and dust particles.

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The tension in the rope at the lower part of the swing is 388.2 N.

The tension in the rope at the lower part of the swing is calculated by applying the following formula.

T = W + Fc

where;

T = mg + mac

T = m (g + ac)

T = m (g + v²/r)

where;

The magnitude of the tension in the ropes is calculated as;

T = 30.8 (9.8  +  4.2²/6.29)

T = 388.2 N

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To find the resistor with the largest resistance, let's use Ohm's law formula V = IR. where V is the voltage, I is the current, and R is the resistance. The resistor A has the largest resistance. The correct answer is resistor A.

We are given that two resistors, A and B, are connected in series to a 9 V battery. Also, the first resistor, A, has a voltage of 6 V across it. This means that the voltage across resistor B is 9 V - 6 V = 3 V.

Now, let's find the resistance of resistor A using Ohm's law:

R = V / I

where V = 6 V and I is the same as the current flowing through resistor B since they are connected in series. Let's assume the current is I.

Therefore,

Ra = 6 V / I

Now, let's find the resistance of resistor B using Ohm's law:

R = V / I

where V = 3 V and I is the current flowing through both resistors in series.

Therefore,

Rb = 3 V / I

We are to find which resistor has the largest resistance.

This means we should compare Ra and Rb.

Ra = 6 V / I

Rb = 3 V / I

To compare the two resistances, we can simplify them as follows:

Ra = 6 / I

Rb = 3 / I

We can see that Ra is twice the value of Rb.

Therefore, resistor A has the largest resistance. Answer: Resistor A

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