Which one of the following types of electromagnetic radiation causes certain substances to fluoresce? A. Ultraviolet rays
B. Infrared waves
C. X rays
D. Cosmic rays

The initial velocity is 12.34 m/s

Explanation:

The vertical component of the initial velocity determines the maximum height.

The formula to apply is : v²=u²+2as , where

v=y-component, final velocity = 0 m/s

u= y-component of the initial velocity = ?

s= distance traveled = 2.3 m

a=acceleration due to gravity = -9.81 m/s²

Using the values in the equation

v²=u²+2as

0²=u²+2×2.3×-9.81

0=u²-45.126

45.126=u²

√45.126= u

6.7175 m/s

The vertical component of velocity is given by;

velocity*sin(angle with horizontal)

velocity=6.7175 / sin 33°

=12.338 m/s

=12.34 m/s

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Finding Initial velocity :brainly.com/question/1858995

Keywords : angle, maximum height, initial velocity, friction

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Given :

Vector A has a magnitude of 63 units and points west, while vector B has the same magnitude and points due south.

To Find :

The magnitude and direction of

a) A + B .

b) A - B.

Solution :

Let , direction in north is given by +j and east is given by +i .

So , and

Now , A + B is given by :

Direction of A+B is 45° north of west .

Also , for A-B :

Direction of A-B is 45° south of west .

( When two vector of same magnitude which are perpendicular to each other are added or subtracted the resultant is always 45° from each of them)

Hence , this is the required solution .

Answer:

More experimental.

Explanation:

A hypothesis is formulated on the basis of some observed, but unexplained behavior.  It is usually preceded by an exclamation from the researcher of "What the heck?  Did you see that?  It went up and turned blue, when it should have gone sideways and turned red."

The observed behavior was unexpected, so the researcher wants to know why.  The first place to start is with an hypothesis:  an explanation of what might be happening.  It must be a "testable" hypothesis - an explanation that provides an avenue for testing whether the hypothesis may contain some truth.  E.g., the lab tech created sufficient momentum in the sample to make it react when he/she moved it from the table to the cabinet.

This can be tested.  Just do the same experiment but control movement of the sample.  If the reaction does NOT occur under the new conditions, then one might advace the observation as a theory.  Ni=ot proven, but the data are consistent with the hypothesis.  A theory is based on some level of experimental results, to move it up from an hypothesis.