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Hitman42 [59]
3 years ago
11

Which material would you take, steel or bricks to design a bridge? Why?

Physics
2 answers:
Vesna [10]3 years ago
4 0

Answer:

steel

Explanation:

steel because steel has more power to hold something up, where bricks arent as stable

SVETLANKA909090 [29]3 years ago
4 0

Answer:Materials Used in Bridge Construction Stones, Timber, Concrete and Steel are the traditional materials that are used to carry out bridge construction. ... Brick was used as a subgroup construction material along with stone construction. Stones as ... This property of steel is an important criterion in the design of structures.

Explanation:

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If a system is isolated the total energy within that system is constant. Consider the case of a hot cup of coffee: when it cools
uranmaximum [27]

Answer:b-The person and the earth

Explanation:

The best system will be the person and earth as a system

It is so because whatever the energy required by the person is derived from earth resource and thus by depleting the earth resource person is getting is required form of energy .

for example person want thermal energy , for this he need coal which is earth resource and thus all the energy is derived from earth and is being converted into some other form of energy.

5 0
3 years ago
A car of mass 940.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 42.5 km/hr (11.8 m/s),
MAVERICK [17]

Answer:

0.39 m/s^2

Explanation:

Parameters given:

Mass of car, m = 940 kg

Speed of car, v = 11.8 m/s

Power supplied by engine, P = 4300 W

To get the acceleration, we must define the relationship between Power and velocity.

Power, P, is given in terms of velocity, v, as:

P = F * v

where F = force

This is because Power is given as:

P = \frac{E}{t} \\\\\\P = \frac{F*d}{t} \\\\\\=> P = F * v

(where E = energy. t = time taken, d = distance moved)

Force, F, is given as:

F = m*a

Therefore, Power will be:

P = m * a * v

Acceleration, a, will then be:

a = \frac{P}{m*v}

a = \frac{4300}{940 * 118} \\\\\\a = 0.39 m/s^2

The acceleration of the car at that time is 0.39 m/s^2

4 0
3 years ago
Read 2 more answers
The voltage across a conductor is increasing at a rate of 2 volts/min and the resistance is decreasing at a rate of 1 ohm/min. U
Lelechka [254]

Answer:

3.5 amperes

Explanation:

I = E/R

I = ?

E = 70volts

R = 20 Ohms

Therefore , I = 70/20

= 3.5 amperes

3 0
3 years ago
A car has a speed of 2 m/s and a mass of 1500 kg. What is the cars kinetic energy?
Kay [80]

Answer:

B

Explanation:

E = mv² / 2

E = (1500kg)(2 m/s)² / 2

E = 6000 J / 2

E = 3000 J

5 0
3 years ago
Read 2 more answers
Which direction is the force of friction?
liraira [26]

Friction always acts opposite to the motion.<em>  (B)</em>

3 0
3 years ago
Read 2 more answers
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