Answer: A, a polished pale yellow surface would likely be the best reflector of heat energy.
Answer:
For the dry and static friction materials, some of these are Rubber, Aluminum, Gold, Platinum,
Explanation:
High friction materials has higher coefficient of friction (COF).
The answer is : <span>A model could be used to test his design in a lab. </span>Marty is developing a new way to heat an airplane's windshield to prevent it from accumulating ice when in flight. A thin layer of clear, conductive material is injected between two layers of thick windshield plastic. A very small electric current is run through the inner material to keep the plastic layers warm. The model that could help Marty develop his design is the kind of model that could be used to test his design in a lab.
Answer:
0.289
Explanation:
Since the body is in equilibrium ( no net movement), then the total upward force must equal the total downward force and also total forward force must equal total backward force
Tension in the rope inclined at 30⁰ to the vertical hhas vertical and horizontal components
vertical component = Tcos 30⁰ and horizontal component = T sin30⁰
T cos 30⁰ = the downward force = mg where m is the mass of 5kg and g is 9.8 m/s² acceleration due to gravity
T cos 30⁰ = 49
T in the inclined rope to the vertical = 49 / cos 30⁰ = 56.58 N
Horizontal component of the tension in the rope = T sin30⁰ = 56.58 sin 30⁰ = 28.29 N
since the 10kg was not moving the frictional force impeding the movement = the horizontal component of the T along the positive x axis since the frictional force will act along the negative x axis
Fr = 28.29 N
coefficient of static friction = Fr / normal (mg) = 28.29 / (10 × 9.8) = 0.289
