Oil can be used to reduce friction.

Physics

2 answers:

WINSTONCH [101]3 years ago

7 0

Answer:

If you're asking if this is true or false, the answer is true.

Explanation:

cestrela7 [59]3 years ago

3 0

Answer:Yes

Explanation: It lower the surface tension between the floor and the object causing friction

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Mary and Jane are standing at each end of an ice board 1.0 m in length. 2 points

madam [21]

Answer:

0.053 m ang answer my phsiycal

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3 years ago

A toy cannon tosses a rubber ball straight upward. A motion sensor measures the speed of the ball as it leaves the cannon. Using

mezya [45]

Answer:

With this information is not possible to calculate the mass.

Explanation:

This is a characteristic problem of energy conservation, where kinetic energy becomes potential energy. For this particular problem, we have the initial speed as input data. The moment the ball comes out of the cannon we have the maximum kinetic energy, as the ball goes up the ball will gain more potential energy as the ball loses kinetic energy, until the moment the ball reaches the maximum height. At the maximum height point, the ball will have its maximum potential energy while its kinetic energy is zero. In other words, all the kinetic energy that was, in the beginning, was transformed into potential energy.

$E_{p}=E_{k}\\m*g*h=0.5*m*v^2$

In the above equation the masses are canceled and we can determine the maximum height, by means of the initial speed.

$h=\frac{0.5*v^2}{g} [m]$

But the mass cannot be determined, since it would be necessary to know the value of the energy, in order to determine the value of the mass.

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3 years ago

A lead ball is dropped into a lake from a diving board 5.0 meters above the water. After entering the water, it sinks to the bot

xxMikexx [17]

Answer:

28.8 meters

Explanation:

We must first determine at which velocity the ball hits the water. To do so we will:

1) Assume no air resistance.

2) Use the Law of conservation of mechanical energy: E=K+P

Where

E is the mechanical energy (which is constant)

K is the kinetic energy.

P is the potential energy.

With this we have $\frac{m}{2} *v^{2} = m*g*h$

Where:

m is the balls's mass <- we will see that it cancels out and as such we don't need to know it.

v is the speed when it hits the water.

g is the gravitational constant (we will assume g=9.8 $\frac{m}{s^{2} }$ .

h is the height from which the ball fell.

Because when we initially drop the ball, all its energy is potential (and $P = - m*g*h$ ) and when it hits the water, all its energy is kinetic ( $K=\frac{m}{2} *v^{2}$ . And all that potential was converted to kinetic energy.