two objects were lifted by a machine. one object had a mass of 2 kilograms and was lifted at the speed of 2 m/s. the other had a mass of 4 kilograms and was lifted at a rate of 3 m/s. which object had more kinetic energy while it was being lifted?"

Answers

Answer 1

Answer: to find the kinetic energy KE=1/2 × mass × velocity ^2
for object 1 ke= 1/2(2)(2^2)=4 J
for object 2 ke= 1/2(4)(3^2)=18J
meaning object 2 as more kinetic energy

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You must exert a force of 4.5 N on a book to slide it across a table. If you do 2.7J of work in the process, how far have you moved the book?

Answers

Answer: 0.6m

Explanation:

Given that:

force = 4.5 N

Work done = 2.7J

Distance moved by the book = ?

Since work is done when force is applied on an object over a distance, apply the formula:

work = force x distance

2.7J = 4.5N x distance

Distance = (2.7J / 4.5N)

Distance = 0.6 m

Thus, the book was moved 0.6 metres far

True or false the size of a population increase if the number of individuals added to the population is equal to the numbers of individuals leaving the population?

Answers

False, the size of a populatin increases if the number of individuals added to the population is greater than the one of the individuals leaving.

What occurs when an object travels in a curved path?

Answers

An object following any type of curved motion will necessarily be changing its direction as it moves. This change in direction constitutes a change in velocity, since velocity is a vector, and, thus, velocity has both a size, the speed, and a direction. So, if an object travels in a curved path, it changes velocity, and, thus, accelerates. This acceleration must be tied to a force. Newton's laws of motion explain this. Therefore, whenever an object travels in a curved path, there must be an unbalanced force acting upon it.

If a characteristic of a parent, such as eye color,does not show up in offspring ,is it gone forever

Answers

No it is not. It is still apart of the offspring's DNA. In fact it might show up in the very next generation!

If u speed up from rest to 12 m/s in 3 seconds, what is your acceleration

Answers

4

Just divide 12 by 3, so if it takes 3 seconds, then every second, it goes up 4.

Acceleration = change in speed/time

Therefore it is 4m/s squared

A train moving with an initial velocity of 20 m/s accelerated at 4 m/s^2 for 10 seconds. During this time, the train moves a distance of how many meters

Answers

Answer:

400 m

Explanation:

Given:

v₀ = 20 m/s

a = 4 m/s²

t = 10 s

Find: Δx

Δx = v₀ t + ½ at²

Δx = (20 m/s) (10 s) + ½ (4 m/s²) (10 s)²

Δx = 400 m

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