Two objects are traveling on the same track. for 10 s, object x has an average acceleration of 3.0 m/s/s. if object y has an initial velocity of 0 m/s and a final velocity of 25 m/s after 10 s, how does it acceleration compared to object x's?

Answers

Answer 1

Answer:

Final answer:

The acceleration of object Y is 2.5 m/s/s which is less than the acceleration of object X which is 3.0 m/s/s.

Explanation:

The acceleration of an object is calculated using the formula: a = (v_f -v_i) / t, where v_f is the final velocity, v_i is the initial velocity and t is time. For object Y, the final velocity is 25m/s, the initial velocity is 0m/s and the time is 10s, hence its acceleration will be (25-0)/10 = 2.5 m/s/s. This indicates that Object Y's acceleration is less compared to Object X's acceleration of 3.0 m/s/s.

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Answer 2

Answer: v=at
v=10a
25/10=a
2.5=a

object x accelerates 0.5m/s faster than object y

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An 81 kg stuntman jumps from the top of a building 29 m above a catching net. Assuming that air resistance exerts a 100 N force on the stuntman as he falls, determine his velocity just before he hits the net

Answers

In order to solve this, we can get all tangled up in acceleration,
or we can just add up the energy budget.

-- Gravitational potential energy = (mass) (grav accel) (height above something)

-- 29 m above the net, his potential energy is (81 x 9.8 x 29) = 23,020 joules

-- All the way down, air resistance exerts 100 N of force against him.
The energy burned up by air resistance is the work done = 100 x 29 = 2,900 joules.

-- The energy he has left when he hits the net is (23,020 - 2,900) = 20,120 joules.

-- When he hits the net, all of his energy is kinetic energy . . . (1/2) (m) (v²)

(1/2) (m) (v²) = 20,120

(40.5) (v²) = 20,120

v² = 20,120 / 40.5

v = square root of (20,120 / 40.5) = 22.3 meters per second (about 50 mph)

________ is the ability to see objects at a distance but not things that are close, while _________ is the ability to see close objects but not things that are at a distance.

Answers

Longsightedness and then shortsightedness

Answer:

Farsighted and Nearsighted

Explanation:

Suppose you decide to cut the wire into two pieces (not necessarily the same length) to shape into two circles. Write a function A ( x ) which models the total area of the two circles in terms of x , the length of one of the pieces of wire. (It may be helpful to use for a circle A = πr 2 and C = 2 πr ). Then find the length x that will minimize the total area.

Answers

Answer:

$2\pi r(r+rx)$

Explanation:

Let the area of one circular side be given by the formula : $A_(1) = \pi r^(2)$

However, the wire is a solid cylinder, then it means that the total area is 2 × $\pi r^(2)$ = $2\pi r^(2)$

However, there is the surface area to consider. This is the curved area of the wire. This is given as:

$A_(2) = lb$

The length is x.

The breadth is calculated as follows - the length of the circle = $\pi D = 2\pi r$

Then the area = lb

= $2\pi rx$

Therefore, the total area is given as $A_(1) + A_(2)$

= $2\pi r^(2) + 2\pi rx\n 2\pi r(r+rx)$

An apple is placed 20.0 cm in front of a diverging lens of focal length 10.0 cm. Find the image distance and the magnification of the apple.

Answers

Answer:

Image distance of apple=-6.7 cm

Magnification of apple=0.33

Explanation:

We are given that an apple is placed 20.cm in front of a diverging lens.

Object distance=u=-20 cm

Focal length=f=-10 cm

Because focal length of diverging lens is negative.

We have to find the image distance and magnification of the apple.

Lens formula

$(1)/(f)=(1)/(v)-(1)/(u)$

Substitute the values then we get

$-(1)/(10)=(1)/(v)+(1)/(20)$

$(1)/(v)=-(1)/(10)-(1)/(20)$

$(1)/(v)=(-2-1)/(20)=-(3)/(20)$

$v=-(20)/(3)=-6.7 cm$

Image distance of apple=-6.7 cm

Magnification=m= $(v)/(u)=(-(20)/(3))/(-20)$

Magnification of apple= $(1)/(3)=0.33$

Hence, the magnification of apple=0.33

What is a quantity Described completely by its magnitude

Answers

Answer:

Scalar

Explanation:

A physical quantity that is completely described by its magnitude; examples of scalars are volume, density, speed, energy, mass, and time. Other quantities, such as force and velocity, have both magnitude and direction and are called vectors.

A species of insect is newly introduced into the United States from the Philippines. This insect becomes established, laying its eggs on the leaves of oak trees. How can a biologist determine if the relationship between the insect and the oak tree is commensalism, mutualism, or parasitism?

Answers

Commensalism describes the interaction between the insect and the oak tree.

What is commensalism?

It is a type of biological interaction between two species in which one of the interacting species is benefitted while the other species is unaffected.

How is the above interaction commensalism?

Since the insect gets a safe place to lay its egg it gains from this interaction while the tree is unaffected.

When will this interaction be a mutualism interaction?

When both the organisms benefit from the interaction.
If the insect helps in the pollination of the tree while the insect gets a safe place to lay its egg.

When will this interaction be a parasitic interaction?

When one of the organism benefit at the expense of the other.
For example, If the insect sucks the sap of the tree on which it lays its egg. The insect benefits while the tree is harmed.

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Answer:

its D!!!

Explanation:

If the insect benefits and the tree neither benefits nor is harmed, the relationship is commensalism.

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