Two students are discussing the motion of the dart-block system at the instant it reaches height H. The students make the following statements: Student 1: The speed of the system at height H is zero. Since it is moving in a circular motion and centripetal acceleration is given by, the acceleration must also be zero. Student 2: The acceleration of the system at height H can’t be zero, or the system would not swing. The acceleration must be equal to g at height H.

Which underlined phrase or phrases, if either, are correct about student 1's statement? If neither phrase is correct, write "none."Read more on Sarthaks. com -

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2