A1.30-m string of weight 0.0121n is tied to the ceiling at its upper end, and the lower end supports a weight w. neglect the very small variation in tension along the length of the string that is produced by the weight of the string. when you pluck the string slightly, the waves traveling up the string obey the equationy(x, t)=(8.50mm)cos(172rad? m? 1x? 2730rad? s? 1t)assume that the tension of the string is constant and equal to w. how much time does it take a pulse to travel the full length of the string? what is the weight w? how many wavelengths are on the string at any instant of time? what is the equation for waves traveling down the string? a. y(x, t)=(8.50mm)cos(172rad? m? 1x? 2730rad? s? 1t)b. y(x, t)=(8.50mm)cos(172rad? m? 1x+2730rad? s? 1t)c. y(x, t)=(10.5mm)cos(172rad? m? 1x+2730rad? s? 1t)d. y(x, t)=(10.5mm)cos(172rad? m? 1x? 2730rad? s? 1t)

Part a)

Part b)

Part c)

Part d)

Explanation:

As we know that

length of the string is L = 1.30 m

weight of the string is W = 0.0121 N

also we know that tension in the spring remains constant

and the Equation of wave in string is given as

Part a)

Speed of wave is given as

here we know that

so we have

so time taken by the wave to reach the top point is given as

Part b)

Also we know that wave speed is given as

here we have

also we have

Part c)

Wavelength of the wave travelling on the string

so number of wavelengths on the string is given as

Part d)

Since the direction of the wave is reversed when it travels back

so here we have equation of wave given as

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.