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3 years ago

What is the smallest unit that makes up matter

Physics

2 answers:

polet [3.4K]3 years ago

4 0

ATOM makes up the smallest matter

hram777 [196]3 years ago

3 0

The smallest unit that makes up matter is an atom!

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Help and explain please

babunello [35]

Answer: a) Moment = 200N.m

b) F = 500N

Explanation: Moment or Torque is the tendency of a body to rotate because of an aplplied force. It can be calculated as

$\tau = F.r.sin\theta$

F is force applied

r is distance from the force to the point of rotation

θ is the angle formed between force and distance

a) Since F and r are perpendicular, θ=90°, sin90° = 1, so

$\tau=F.r$

$\tau=100(2)$

$\tau=$ 200

Torque caused by weight of the barrier at the pivot is 200N.m

b) Counterweight has the same torque as pivot: $\tau=$ 200

So, to find Force necessary to balance the weight:

$\tau=F.r$

$F=\frac{\tau}{r}$

$F=\frac{200}{0.4}$

F = 500

It is necessary a force of 500N from the counterweight to balance the weight.

4 0

3 years ago

A rock is placed on a balance and its mass is determined as 18.3 g. When the rock is then placed in a graduated cylinder that or

Crank

Answer : The density of rock reported should be, 3.1 g/mL

Explanation :

Mass of rock = 18.3 g

Original volume of water = 11.1 mL

New volume of water = 17.0 mL

First we have to calculate the volume of rock.

Volume of rock = New volume of water - Original volume of water

Volume of rock = 17.0 mL - 11.1 mL

Volume of rock = 5.9 mL

Now we have to determine the density of rock.

Formula used :

$\text{Density of rock}=\frac{\text{Mass of rock}}{\text{Volume of rock}}$

$\text{Density of rock}=\frac{18.3g}{5.9mL}=3.1g.mL$

Thus, the density of rock reported should be, 3.1 g/mL

8 0

4 years ago

A racecar driver on a flat racetrack steps on the gas, changing her velocity from 10 m/sec to 30 m/sec in 5 seconds. What is the

erastova [34]

Answer:

4m/s2

Explanation:

The following data were obtained from the question:

U (initial velocity) = 10m/s

V (final velocity) = 30m/s

t (time) = 5secs

a (acceleration) =?

Acceleration is the rate of change of velocity with time. It is represented mathematically as:

a = (V - U)/t

Now, with this equation i.e

a = (V - U)/t, we can calculate the acceleration of the race car as follow:

a = (V - U)/t

a = (30 - 10)/5

a = 20/5

a = 4m/s2

Therefore, the acceleration of the race car is 4m/s2

8 0

4 years ago

Read 2 more answers

A car of mass 900 kg is traveling at 20 m/s when the brakes are applied. The car then comes to a complete stop in 5 s. What is t

ollegr [7]

Answer:

A. 36,000 W

Explanation:

$m$ = mass of the car = 900 kg

$v_{o}$ = Initial speed of the car = 20 m/s

$v_{f}$ = Final speed of the car = 0 m/s

$W$ = Work done by the brakes on the car

Magnitude of work done on the car by the brakes is same as the change in kinetic energy of the car.hence

$W = (0.5) m (v_{o}^{2} - v_{f}^{2})\\W = (0.5) (900) ((20)^{2} - (0)^{2})\\W = 180000 J$

$t$ = time taken by the car to come to stop = 5 s

$P$ = Average power produced by the car

Average power produced by the car is given as

$P = \frac{W}{t} =\frac{180000}{5} \\P = 36000 W$

8 0

3 years ago

calculate the gravitational force in between two objects of mass 25 kg and 20 kg if distance between them is 5m

sladkih [1.3K]

Answer:

Gravitational force is 1.33 × 10^-9 N

Explanation:

$force = \frac{GMm}{ {r}^{2} }$

${ \sf{ = \frac{6.67 \times {10}^{ - 11} \times 25 \times 20 }{ {5}^{2} } }} \\ \\ = { \sf{1.33 \times {10}^{ - 9} \: newtons }}$

5 0

3 years ago