Which of the following actions would make a pulse travel faster along a stretched string? more than one answer may be correct. if so, give all that are correct. a. move your hand up and down more quickly as you generate the pulse. b. move your hand up and down a larger distance as you generate the pulse. c. use a heavier string of the same length, under the same tension. d. use a lighter string of the same length, under the same tension. e. stretch the string tighter to increase the tension. f. loosen the string to decrease the tension. g. put more force into the wave.

Option d and e are correct.

Explanation:

The expression for velocity of pulse in a stretched string can be given as follows

v =

where T is tension in the string , m is mass of string per unit length.

Use of  lighter string of the same length, under the same tension  amounts to higher m so velocity will decrease. Hence option d is correct.

Similarly, v is directly  proportional to square root of tension. So if we increase tension , velocity also increases. So option e ) is correct.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

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