Answer: C. Cognitive, moral
A cognitive development is related with the development of intellectual capabilities of an individual. These are responsible for improving the thinking and learning perspective of the individual. Moral dimensions are related to ethics involved in learning and thinking process of the individual. Learning to think critically and explaining your answers are part of the cognitive ability and moral dimensions of development.
<u>Answer:</u>
The correct answer option is C. buzzer.
<u>Explanation:</u>
We know that Jeff's father needs to get a device from his workshop that converts electrical energy to sound energy.
So from the given options, buzzer is the best option Jeff's father can install in his house's security system.
An electric buzzer converts an electrical oscillating voltage into a sound output. In other words, the electrical pulses are converted into sound vibrations.
An example of scalar quantity is speed and an example of vector quantity is velocity.
A scalar quantity is a physical quantity that only has a magnitude(just a numerical value) but doesn't have any other characteristic like direction.
A vector quantity is a physical quantity that has both magnitude and direction.
Answer:
The ball has an initial linear kinetic energy and initial rotational kinetic energy which can both be converted into gravitational potential energy. Therefore the hill with friction will let the ball reach higher.
Explanation:
The ball has an initial linear kinetic energy and initial rotational kinetic energy which can both be converted into gravitational potential energy. Therefore the hill with friction will let the ball reach higher.
This is because:
If we consider the ball initially at rest on a frictionless surface and a force is exerted through the centre of mass of the ball, it will slide across the surface with no rotation, and thus, there will only be translational motion.
Now, if there is friction and force is again applied to the stationary ball, the frictional force will act in the opposite direction to the force but at the edge of the ball that rests on the ground. This friction generates a torque on the ball which starts the rotation.
Therefore, static friction is infact necessary for a ball to begin rolling.
Now, from the top of the ball, it will move at a speed 2v, while the centre of mass of the ball will move at a speed v and lastly, the bottom edge of the ball will instantaneously be at rest. So as the edge touching the ground is stationary, it experiences no friction.
So friction is necessary for a ball to start rolling but once the rolling condition has been met the ball experiences no friction.
Your hypothesis can be that the group with calculators would finish faster than the group without calculators.