The Cenozoic Era is best described as the era in which

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Answer 1

Answer: The era after the KT event occurred

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A stuntman jumps from the roof of a building to the safety net below. How far has the stuntman fallen after 1.6 seconds?

Answers

The distance covered by the stuntman in 1.6 meters after he jumps form the roof of a building is 12.544 meters.

What is acceleration?

Acceleration is the rate of change of the velocity of an object with respect to the time taken to travel. Acceleration is a vector quantity. The orientation of an object's acceleration can be given by the orientation of the net force which is acting on that object.

The stuntman fallen after 1.6 meters after he jumps from the roof, the distance covered by the stuntman is:

s = ut + 1/2 at²

s = distance or displacement,

u = initial velocity,

t = time taken,

a = acceleration of the object

s = 0 × 1.6 + 1/2 × 9.8 × (1.6)²

s = 0 + 4.9 × 2.56

s = 12.544m

Therefore, the distance covered by the stuntman is 12.544 meters.

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ok.....

Given,
Time = 1.6 seconds

We know,
initial velocity = 0 m/s²
acceleration (due to gravity) = 9.8 m/s²

Now,
We know,
$s=ut+ (1)/(2)at^2\n\n Substituting \ the \ given\ and\ known\ values,\ we\ get,\n \n s=(0)(1.6)+ (1)/(2)(9.8)(1.6)^2\n\nNow,\ Using\ the\ calculator\, we\ get,\n\n s = 0+12.544\n\ns = 12.544\ m$

So, the stuntman has fallen 12.544 meters.

If gravity did not affect the pain of a horizontally thrown ball the ball would

Answers

If gravity had no effect on a ball after you threw it ... and there also
were no air to slow it down ... then the ball would continue traveling
in a straight line, in whatever direction you threw it.

That's the heart and soul of Newton's laws of motion ... any object
keeps moving at the same speed, and in a straight line in the same
direction, until a force acts on it to change its speed or direction.\

If you threw the ball horizontally, then it would keep moving in the
same direction you threw it. But don't forget: The Earth is not flat.
The Earth is a sphere. So, as the ball kept going farther and farther
in the same straight line, the Earth would curve away from it, and it
would look like the ball is getting farther and farther from the ground.

If gravity did not affect a horizontally thrown ball, the ball would continue along its horizontal path indefinitely (assuming it is thrown in a vacuum so no other forces are acting on it).

What happens to the energy that is lost when water freezes

Answers

Water from a liquid state hasinternal energy in them that defines the translational and rotational energy ofthe molecules of water. However, when water freezes, it slowly turns into solidphase and therefore lesser temperature is applied to freeze the watermolecules. The energy that is lost in the liquid is transferred to the solidstate of the water. Even though there is little or no movement of watermolecules in the solid state, there is still internal energy of the water.

Occurs when fuel rods produce too much heat

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This is known as nuclear meltdown.

when the u-235 nucleus absorbs a thermal neutron, ba-141 and kr-92 nuclei are produced along with some neutrons. how many neutrons are emitted?

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A neutron is absorbed by the original uranium-235 nucleus before it splits into two new nuclei, krypton-92 and barium-141, which also releases three additional neutrons. These three neutrons can then split three more uranium-235 nuclei, releasing more neutrons with each fission, and so on.

When does a thermal neutron enter the U-235 nucleus?

A U-235 nucleus splits into two pieces when it takes in an extra neutron. Fission is the name of this process. Two to three neutrons are released each time a U-235 nucleus splits. Consequently, starting a chain reaction is a possibility.

U-235 atoms take in free neutrons during fission. Due to this, U-235 becomes unstable and fragments into two light atoms known as fission products.

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A block of metal initially at 25°C is submerged in water initially at 75°C in a coffee cup. Which of the following is true? a. The final temperature of the coffee cup will be less than 20°C.
b. The final temperature of the coffee cup will be higher than 25°C but less than 75°C.
c. The final temperature of the coffee cup will be more than 80°C.
d. The final temperature of the coffee cup will be 80°C.

Answers

Answer:

b. The final temperature of the coffee cup will be higher than 25°C but less than 75°C.

Explanation:

We know in thermal equilibrium.

Heat loss by one object = Heat gain by other object.

Now, heat is loss by the object whose temperature is higher than other because heat travels from high temperature to other.

And the object who gain heat its temperature increases till both body reach same temperature.

In this case, water loss heat, therefore its temperature decreases.

Similarly , metal block is at low temperature so its temperature increases.

Therefore , both water and metal block must have temperature less than $75^0C$ and $25^0C$ to have thermal equilibrium.

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Suppose that at room temperature, a certain aluminum bar is 1.0000 m long. The bar gets longer when its temperature is raised. The length l of the bar obeys the following relation: l=1.0000+2.4×10−5T, where T is the number of degrees Celsius above room temperature. What is the change of the bar's length if the temperature is raised to 14.1 ∘C above room temperature?