Answer:
<em>pulling</em>
Explanation:
When stretching, the right way to stretch is to stretch until one feels the tension pull in the muscle. This pull is then held and sustained for a period of about 15 to 60 seconds. This considered the safest way to stretch, and it gives the muscles and connective tissue time to “reset” the stretch reflex.
Answer:
12 m
Explanation:
Hi! The ecplanation is based on the figure. Lets call the mirrors M1 and M2. Your head is the triangle called A, facing towards M1
Then:
A' is the image (virtual) of A given by M1. This is the image of your face.
A'' is the image of A given by M2. This image A'' when reflected by M1 produces image A'''. This is the image of the back of your head you see. It is 12 m away of you.
Answer:
The answer is
A. Incident rays that are parallel to the central axis are dispersed but will be perceived as originating from a point on the near side of the mirror.
Explanation:
The images formed by a convex mirror is virtual, diminished and images are always formed between the Focal point and the pole of the mirror.
Convex mirrors are used as car driving mirrors because they form upright images and also give wider field of view (dispersed) , and notice that in the car driving mirrors there is a warning "objects appear closer than they are "
Which explains our answer, that images are perceived from a near side
Answer:
3.At equilibrium, its instantaneous velocity is at maximum
Explanation:
The motion of a mass on the end of a spring is a simple harmonic motion. In a simple harmonic motion, the total mechanical energy of the system is constant, and it is sum of the elastic potential energy (U) and the kinetic energy of the mass (K):
where
k is the spring constant
x is the displacement of the spring from equilibrium
m is the mass
v is the speed
As we see from the formula, since the total energy E is constant, when the displacement (x) increases, the speed (v) increases, and viceversa. Therefore, when the mass is at its equilibrium position (which corresponds to x=0), the velocity of the mass will be maximum.
1,2: When simple molecular substances melt or boil, it is these weak intermolecular forces that are overcome. The covalent bonds are not broken. Relative little energy is needed to overcome the intermolecular forces, so simple molecular substances have a low melting and boiling points.
3: Water, Almost no living thing can survive without water. Water is everywhere on our planet. It is the reason we have an organic life on earth. A water molecule consists of one oxygen atom combined with two hydrogen atoms. We use water throughout day and night; in drinking, cooking, household needs, industries, and agriculture. Apart from these general uses of water, you might be amazed to know that water plays a major role in volcanic eruptions.