Acontinuous signal is described by 15 sin( 100t + pi/2).
its numerical value at t = 0 seconds is given by

a. 15.
b. pi/2.
c. 100.
d. 0.

Option A) 15        

Step-by-step explanation:

We are given the following in the question:

The above expression describes a continuous signal.

We have to find the numerical value at t = 0.

Putting t = 0, we get,

Thus, the value of the signal is 15 at t = 0.

Option A) 15

9.55 degrees.

step-by-step explanation:

the given angle is

1 cycle is equal to 2π radians. so 4π will be equal to two cycles.

5.166667π-4π = 1.166667π

hence, this angle goes a little more than negative x axis.

1.166667π-π= 0.166667π

hence, the reference angle is 0.166667π radians.

1 radian = 57.2958 degrees

now, in degrees, this should be equals to 9.55 degrees.