Answer:
cross-sectional
Explanation:
The full definition of this is ''a research design in which several different age-groups of participants are studied at one particular point in time.''
Answer: Mechanical Energy and Electrical Energy
Explanation: A generator converts mechanical energy into electrical energy, while a motor does the opposite - it converts electrical energy into mechanical energy.
Answer:
The riders work becomes a combination of gravitational potential,
kinetic energy and heat.
Explanation:
His work becomes gravitational potential as the raider gains height. This can be seen from the equation of gravitational potential:
,
where m is the mass, g is the gravity and h is the height. Since the rider's final position is higher than his starting position the change of gravitational position is greater than 0.
His work becomes kinetic energy as he gains speed: assuming he was at rest at starting position he must increase his speed to move to the top of the hill, and because kinetic energy depends on speed, part of his work becomes kinetic energy.
Finally, part of his work turns into heat due to all the losses because of the friction in the bicycle gears.
The initial speed of the skier is 14 m/s.
The maximum height attained by the skier is 15 m.
<h3>
Initial speed of the skier</h3>
The initial speed of the skier is determined by using the following kinematic equation.
<h3>Maximum height attained</h3>
The maximum height attained by the skier is calculated as follows;
Thus, the maximum height attained by the skier is (10 + 5) = 15 m.
Learn more about maximum height of projectile here: brainly.com/question/12870645
Answer:
past temperature, composition of gases in the atmosphere
Explanation:
Cylindrical cones can be drilled out from the core of glaciers to calculate past temperatures. The air bubbles in the cones can also be used to determine the composition of air in the past yars. This information provides us a means to analyze the trend of global warming and change in concentratinos of green house gases over the years.