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pishuonlain [190]

4 years ago

15

A rectangular solid of unknown density is 5 cm long, 2 cm high and 4 cm wide. The mass of this solid is 320 grams. Given this in

formation, calculate its density.

1 answer:

lorasvet [3.4K]4 years ago

7 0

Answer:

Explanation:gvfutt RuyrOk really ryrureutihrhrrhrufhfhhchchv

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Any forensic scientist is equipped to study an explosion crime site.

arsen [322]

Answer:

false

Explanation:

I had the same answer for this question on my schoolwork

:) HOPE THIS HELPS

3 0

3 years ago

In the fabrication of an electrical extension cord, the manufacturer wants to reduce the overall resistance of the wires in the

Bezzdna [24]

Answer:

Option B is correct.

Explanation:

The resistance of a material or wire is represented by the formula below.

R=(ρL)/A

where

R is resistance of wire
ρ is the resistivity of the material
A is the cross sectional area of wire
L is length of wire

Resistance increases with increase in length and resistivity which means options C and D are wrong.

A=(π $d^{2}$ )/4

An increase in diameter will result in a proportional increase in area

From the resistance formula, an increase in area will cause a reduction in the resistance of the material.Thus increased diameter of wire will lower the resistance of wire. Option B is correct

Have a great day

5 0

3 years ago

Two trains on separate tracks move toward each other. Train 1 has a speed of 125 km/h; train 2, a speed of 94.0 km/h. Train 2 bl

dexar [7]

Answer:

$f_{o}=595.98Hz$

Explanation:

Given data

Train 1 speed v₀=125 km/h =34.7222 m/s

Train 2 speed vs=94.0 km/h=26.1111 m/s

Speed of sound v=343 m/s

Train 2 frequency fs=500 Hz

To find

Frequency f₀ heard by engineer on train 1

Solution

We can use below formula to find the required frequency

$f_{o}=f_{s}(\frac{v+v_{o}}{v-v_{s}} )\\f_{o}=(500Hz)(\frac{343m/s+34.722m/s}{343m/s-26.111m/s} ) \\f_{o}=595.98Hz$

4 0

3 years ago

Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, t

frozen [14]

Answer:

Their final velocity is 0.103 m/s

Explanation:

Given;

mass of the first car, m₁ = 130,000 kg

mass of the second car, m₂ = 115,000 kg

initial velocity of the first car, u₁ = 0.300 m/s

initial velocity of the second car, u₂ = -0.120 m/s

Let their final velocity, = v (since they were coupled together, they will have common final velocity)

Apply the principle of conservation of linear momentum;

Total momentum before collision = Total momentum after collision

m₁u₁ + m₂u₂ = v(m₁ + m₂)

(130,000 x 0.3) + (115,000 x -0.12) = v(130,000 + (115,000)

39000 -13800 = 245,000v

25200 = 245,000v

v = 25200 / 245,000

v = 0.103 m/s

Therefore, their final velocity is 0.103 m/s

6 0

4 years ago

What mass of water in grams will fill a tank 100 cm long, 50 cm wide, and 30 cm high

AlekseyPX

Answer: 150000 g

Explanation:

Firstly, we need to calculate the volume of the tank $V_{tank}$ :

$V_{tank}=(length)(width)(height)$

$V_{tank}=(100 cm)(50 cm)(30 cm)=150000 cm^{3}$ (1)

Now, $V_{tank}$ is the volume that has to be filled with water, this means the volume water occupies in the tank $V_{water}$ must be equal to the volume of the tank:

$V_{water}=V_{tank}=150000 cm^{3}$ (2)

On the other hand, the density of water $\rho_{water}$ is $1 g/cm^{3}$ and establishes the relation between its mass $m_{water}$ and its volume $V_{water}$ :

$\rho_{water}=\frac{m_{water}}{V_{water}}$ (3)

Clearing $m_{water}$ :

$m_{water}=\rho_{water} V_{water}$ (4)

$m_{water}=(1 g/cm^{3})(150000 cm^{3})$ (5)

Finally:

$m_{water}=150000 g$

5 0

3 years ago