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3 years ago

9

How do you find the density of an object?

2 answers:

Travka [436]3 years ago

8 0

Density is mass divided by volume p=m/v

Setler79 [48]3 years ago

6 0

You need to find the mass of the object aswell as its volume.

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5. A ball is sitting at rest on the floor. What will happen if a balanced force is applied to the ball? *

Leno4ka [110]

When the balanced force is applied on the ball It will roll away from the force.

<u>Explanation:</u>

A ball lies on the floor in rest. If the balanced force is applied to

the ball, the force will push away.

The forces would include gravity and the forces of air particles entering the ball from almost all directions.
And the ground is exercising the force and shifting away from the impact.

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3 0

3 years ago

Precision is how close a series of measurements are to ______

Leya [2.2K]

Answer:

Accuracy is how close a measured value is to an accepted value. <u>Precision is how close measurements are to one another.</u> To make measurements, you have to evaluate both the accuracy and the precision to get a correct value.

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3 years ago

Who was this scientist, what ideas did he form, and how did he figure out these new ideas of atoms?

saul85 [17]

Answer:

Atoms cannot be divided.

Explanation:

5 0

3 years ago

A plate has an area of 1m square. It slide down an incline plane , having an angle of inclined 60° to horizontal, which a veloci

Solnce55 [7]

Answer:

$\mu =0.169704 Ns/m^2$

Explanation:

From the question we are told that

Area of plate $a=1m^2$

Angle of inclination $\theta=60 \textdegree$

Velocity $v=0.75m/s$

Thickness of oil $t=2mm$

Weight of plate $w=90N$

Generally the equation for shear force is mathematically given by

$F=mgsin45 \textdegree$

$F=90sin45 \textdegree$

$F=63.639N$

$F=\mu* \frac{v}{t}$

$F=\mu* \frac{0.75}{2*10^-^3}$

$\mu* \frac{0.75}{2*10^-^3}=63.639N$

$\mu =\frac{63.639}{375}$

Therefore viscosity is given by

$\mu =0.169704 Ns/m^2$

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3 years ago

Suppose you are helping Galileo measure the acceleration due to gravity by dropping a canon ball from the tower of Pisa, You mea

Anni [7]

It is given that the height of the tower is

$h=183 ft.$

The uncertainty the measurement of this height is

$\Delta h=0.2 ft$

Drop time is measured as:

$t=3.5s$

The uncertainty in measurement of time is:

$\Delta t=0.5 s$

Using the equation of motion: $h=ut+\frac{1}{2} at^2$ where, $h$ is the distance covered, $u$ is the initial velocity, $a$ is the acceleration and $t$ is the time.

$u=0$ (because canon ball is in free fall). we need to calculate the value of a=g.

$\Rightarrow h=\frac{1}{2}gt^2$

$\Rightarrow g=\frac{2h}{t^2}\\ \Rightarrow g=\frac{2\times 183ft}{(3.5s)^2}=29.87 ft/s^2$

The uncertainty in this value is given by:

$\Delta g=g\sqrt{(\frac{\Delta h}{h})^2+(\frac{2\Delta t}{t})^2}$

Substitute the values:

$\Delta g=29.87\sqrt{(\frac{0.2 }{183})^2+(\frac{2\times 0.5}{3.5})^2}=29.87\sqrt{1.19\times 10^{-6}+0.08}=29.87\times \sqrt{0.08}=29.87\times 0.28=8.44 ft/s^2$

5 0

4 years ago