Answer:
A person's shoe has area of 44cm2 on the ground, their weight is 650N. What is their pressure (in N/cm2) A piece of glass can withstand a pressure of 21000 N/m2, what is the minimum force needed to break the glass with a special hammer of surface 3 cm by 4cm.Ice cracks if the pressure on it is more than 3000 N/m2. If a man of mass 800N wants to safely walk over the ice what area do each of his snow boots need to be in m2.
Explanation:
Answer:
The excess charge has distributed itself evenly over the outside surface of the sphere.
Explanation:
Since the hollow sphere is a conductor, it has free electrons that can move about within the sphere. In this light, an excess charge, the like charges repels each other, therefore ensuring that charges are spread as far apart as possible. There is therefore an evenly distributed charge on the outside surface of the sphere.
Answer:
They fell at the same time.
Explanation:
Galileo was the first to discover the property of gravity, in which it makes everything fall at the same time in an airtight space. Gravity makes all objects fall and accelerate at 9.8m/s/s, regardless of weight, because the ratio between the weight of the object and the air resistance acting against it is a constant.
Answer:
Explanation:
When the velocity of an object changes, it would experience an impulse. If the mass of the object stays the same, and that the object moves along a line, the value of the impulse
would be:
, where
is the mass of the object, and
is the change in the velocity of the object.
On the other hand, the change in the object's velocity can be found with the equation:
.
Note that if
is in
and
is in
, the unit of
would be
.
<h3>a.</h3>
.
.
.
.
<h3>b.</h3>
.
.
![\Delta v = v_{\text{final}} - v_\text{initial} = -12.0\; \rm m \cdot s^{-1}](https://tex.z-dn.net/?f=%5CDelta%20v%20%3D%20v_%7B%5Ctext%7Bfinal%7D%7D%20-%20v_%5Ctext%7Binitial%7D%20%3D%20-12.0%5C%3B%20%5Crm%20m%20%5Ccdot%20s%5E%7B-1%7D)
.
<h3>c.</h3>
.
.
.
.
<h3>d.</h3>
.
.
Note that
and
are of opposite signs. The reason is that the object's velocity has changed direction in this period.
.
.
Thermal conductivity is the ability of a material to conduct heat.
hope this helped:)