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4 years ago

Which best explains why a wood- burning fireplace represents an open system?

Physics

2 answers:

Anna11 [10]4 years ago

6 0

D. Fire requires oxygen

11111nata11111 [884]4 years ago

4 0

D-Because a fire requires oxygen from the atmosphere to burn

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You're driving down the highway late one night at 21 m/s when a deer steps onto the road 35 m in front of you. Your reaction tim

andreev551 [17]

Speed with which initially car is moving is 21 m/s

Reaction time = 0.50 s

distance traveled in the reaction time d = v t

d = 21 * 0.50 = 10.5 m

deceleration after this time = -10 m/s^2

now the distance traveled by the car after applying bakes

$v_f^2 - v_i^2 = 2a d$

$0 - 21^2 = 2(-10)d$

$d = 22.05 m$

so total distance moved before it stop

d = 22.05 + 10.5 = 32.55 m

so the distance from deer is 35 - 32.55 = 2.45 m

now to find the maximum speed with we can move we will assume that we will just touch the deer when we stop

so our distance after brakes are applied is d = 35 - 10.5 = 24.5 m

again by kinematics

$v_f^2 - v_i^2 = 2 ad$

$0 - v^2 = 2(-10)(24.5)$

$v = 22.1 m/s$

so maximum speed would be 22.1 m/s

5 0

3 years ago

Astronomers estimate that a 2.0 km diameter asteroid collides with the Earth once every million years. The collision could pose

Finger [1]

The energy that will be released will be 8.95×10^(21) Joules
for comparison, the Nagasaki atom bomb released 8.8*10^(13) Joules
so this meteorite is (8.95×10^(21))/(8.8*10^(13))=100×10^6 (100 million) times more destructive

5 0

3 years ago

Doe anyone get this

8_murik_8 [283]

Answer:

we know a = F/ M

Explanation:

2 m/s²
0.19 m/s²
9.25 m/ s²
0.04 m/s²
100.39 m/s²

4 0

3 years ago

An ore car of mass 35000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 17 m lower vert

BaLLatris [955]

Answer:

Explanation:

Given

mass of car $m=35,000 kg$

Vertical displacement $h=17 m$

spring constant $k=5.3\times 10^5 N/m$

Considering we need to find out compression in the spring when it reaches to ground

Here Gravitational potential Energy is converted to kinetic energy which finally converts to Elastic Potential Energy

suppose x is the compression in spring

Potential Energy=mgh

Elastic potential energy $=\frac{1}{2}kx^2$

$35000\times 10\times 17=0.5\times 5.3\times 10^5\times x^2$

$x=4.73 m$

7 0

3 years ago

Help! DOWN BELOW<br> NO SCAM PLEASE

KiRa [710]

Answer:

C, 4.5 billion years ago, i think

Explanation:

8 0

2 years ago

Read 2 more answers