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3 years ago

1. List five exothermic reactions that are going on around you. (10 points)

Physics

1 answer:

KonstantinChe [14]3 years ago

5 0

Answer :

Exothermic reactions are those reactions in which a system releases its heat energy to surroundings whereas during endothermic reactions a system absorbs heat energy from surroundings.

Explanation :

Five exothermic reactions that are going on around us

a) Making of ice cubes

b) Rusting of iron

c) Nuclear fission reaction

d) Cellular respiration

e) Condensation of water vapor to form rain.

Following are some endothermic reactions;

1) Photosynthesis $6CO_{2}+12H_{2}O\xrightarrow[sunlight]{chlorophyll}C_{6}H_{12}O_{6}+6H_{2}O+6O_{2}$

2) Mixing of water in Ammonium Nitrate $NH_{4}NO_{3}(s)\overset{H_{2}O(l)}{\rightarrow}NH^{_{3}(aq)}+H_{3}O^{+}$

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Which statement will be true if you increase the frequency of a periodic wave?

-BARSIC- [3]

"The number of waves per second will increase" is the statement among the choices given in the question that will be true if you increase the frequency of a periodic wave. The correct option among all the options that are given in the question is the first option or option "A". I hope that the answer has helped you.

6 0

3 years ago

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Hydrogen and chlorine are pure substances , or

Dvinal [7]

Answer:

or pure hydrogen

Explanation:

hope this helps you because this is the answer i have for you

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3 years ago

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Could you please solve it with shiwing the full work

tia_tia [17]

Answer:

1.V= 640.48 m/s :total velocity in t= 5s

2. Y= 5.79m : vertical distance above the height of release (in meters) where the ball will hit a wall 13.0 m away

3. v =25m/s

4. s= (-1.5t³+26t ) m

Explanation:

1. Parabolic movement in the x-y plane , t=5s

V₀=638.6 m/s=Vx :Constant velocity in x

Vy=V₀y +gt= 0+9.8*5 = 49 m/s : variable velocity in y

$v=\sqrt{v_{x} ^{2} +v_{y} ^{2} }$

$v=\sqrt{ 638.6^{2} +49 ^{2} }$

V= 640.48 m/s : total velocity in t= 5s

2. $v_{ox} =v_{o} cos33.2=20.9*cos33,2= 17.49 m/s$

$v_{oy}=v_{o}*sin33,2 =20.9*sin33,2=11.44 m/s$

x=v₀x*t

13=v₀x*t

13=17.49*t

t=13/17.49=0.743s : time for 13.0 m away

th=v₀y/g=11.44/9.8= 1,17s :time for maximum height

at t=0.743 sthe ball is going up ,then g is negative

y=v₀y*t - 1/2 *g¨*t²

y=11.44*0.743 -1/2*9.8*0.743²

y= 5.79m : vertical distance above the height of release (in meters) where the ball will hit a wall 13.0 m away

3. s = (1t3 + -5t2 + 3) m

v=3t²-10t=3*25-50=75-50=25m/s

at t=0, s=3 m

at t=5s s=5³-5*5²+3

4. a = (-9t) m/s2

a=dv/dt=-9t

dv=-9tdt

v=∫ -9tdt

v=-9t²/2 + C1 equation (1)

in t=0 , v₀=26m/s ,in the equation (1) C1= 26

v=-9t²/2 + 26=ds/dt

ds=( -9t²/2 + 26)dt

s= ∫( -9t²/2 + 26)dt

s= -9t³/6+26t+C2 Equation 2

t = 0, s = 0 , C2=0

s= (-9t³/6+26t ) m

s= (-1.5t³+26t ) m

5 0

3 years ago

If a force of 8 N acts on a mass of 2 kg for a period of 24 seconds, what was the magnitude of the impulse given to the mass?

lyudmila [28]

Answer:

192Ns

Explanation:

The following were obtained from the question:

M = 2kg

F = 8N

t = 24secs

Impulse =?

Impulse = Ft

Impulse = 8 x 24 = 192Ns

5 0

3 years ago

A hunter shoots a stone from his catapult with an initial velocity of 40 m per seconds add elevation of 60 degree with the aim o

Paladinen [302]

Answer:

approximately 7 seconds

Explanation:

The given scenario is just an example of Projectile Motion.

In this question, we are given:

- Initial Velocity (u) = 40 m/s

- Angle of Elevation (θ) = 60 degrees

- Distance of Bird (s) = 145 meters [Not used for the time of flight]

Time of Flight:

$T = \frac{2uSin(\theta)}{g}$

we will use g = 9.8 m/s/s since we are not told otherwise.
$T = \frac{2(40)Sin(60 degrees)}{9.8}$

$T = \frac{40\sqrt{3}}{9.8}$

T = 4.081(√3) seconds
rounded to 7 seconds

7 0

3 years ago