18. A particle moves in the XY plane under the action of a force F such that the value of
linear momentum (p) at any time is px=2 cost,
Py=2sint. The angle o between F and p at a
given time 't' will be

Answer t= 90°

explantion:Force is defined as the rate of change of momentum.

P

x

​

=2cost

P

y

​

=2sint

P

=2cost

i

^

+2sint

j

^

​

F=

dt

dP

​

F

x

​

=−2sint

F

y

​

=2cost

From law of vector dot product,

A

.

B

=ABcosθ

Where θ is angle between them.

cosθ=

AB

A

.

B

​

Here,

cosθ=

FP

F

.

P

​

cosθ=

FP

−2cost×2sint+2cost+2sint

​

cosθ=0

θ=90°

s the environmental science is a broader field that incorporates many elements of earth and life sciences, whereas ecology is usually more focused on how organisms interact with each other and their surroundings, and often on a very specific population of living things. soo yea

explanation:

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.