Answer:
Explanation:
When the box is on the ramp , component of its weight along the ramp
= mg sinθ
Friction force acting on it in upward direction
=μ mg cosθ
For sliding
μ mg cosθ < mg sinθ
μ cosθ < sinθ
.5 x cos35 < sin35
.41 < .57
So the box will slide
When sliding starts , kinetic friction acts
Net force in downward direction
mgsinθ - μ mg cosθ
acceleration
= gsinθ - μ g cosθ
= 5.62 - .3 x 9.8 x cos35
= 5.62 - 2.4
= 3.22 m /s²
Answer:
when two object at different temperatures are in contact with each other.
Explanation:
Answer:
A. They can transfer energy through a vacuum
C. They vibrate in two directions that are perpendicular to each other
D. They radiate outward in all directions
Explanation:
The formulae for range and flight time for a given launch from ground level at angle θ are
<span>
R=<span><span><span>v2</span>sin2θ</span>g</span></span>
and
<span>
T=<span><span>2vsinθ</span>g</span></span>
these follow from the equations of motion and the parabolic/symmetric shape of flight without air resiatance
you can see that you will max out on range at
<span><span>
θ=<span>45o</span></span></span>