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3 years ago

in a given chemical reaction the energy of the products is greater than the energy of the reactants this is because

1 answer:

7 0

<span> A reaction in which energy is absorbed from the surroundings is called an endothermic reaction. In endothermic reactions the enthalpy of the products is greater than the enthalpy of the reactants. Exothermic reactions heat up their surroundings while endothermic reactions cool them down.
I hope this helps you </span>

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What is the average speed of a car that traveled 222.0 miles in 4.596 hours?

Ratling [72]

Answer:

48.3mph

Explanation:

Given that

Distance = 222.0miles

Time = 4.596hours

Average speed = total distance/total time

= 222.0miles/4.596

= 48.3mph

Hence the average speed is 48.3mph

8 0

2 years ago

Find the voltage across the 15 Ohm resistor plz help ty

jonny [76]

Answer:

5.4 Volts is the answer!

Explanation:

Good luck with Acellus!

7 0

2 years ago

At time t=0 a grinding wheel has an angular velocity of 28.0 rad/s . It has a constant angular acceleration of 35.0 rad/s2 until

notsponge [240]

Answer:

a). $x_{t}=583.3rad$

b). $t_{total}=10.52s$

c). $a=12.62 \frac{rad}{s^2}$

Explanation:

The angular acceleration is constant so we can use the formulas of uniform motion with the model of angular acceleration

a).

$x_{r}=x_{i}+v_{i}+\frac{1}{2}a_{a}*t^2$

$x_{r}=0+28.0\frac{rad}{s}*2.20s+\frac{1}{2}*35.0\frac{rad}{s^2}*2.20s$

$x_{r}=146.3rad$

so the total angle between t=0 and the time it stopped is

$x_{t}=146.3rad+437rad=583.3rad$

b).

$w_{f}=w_{o}+a*t$

$w_{f}=28.0rad/s+35rad/s^2*2.2s=105rad/s$ = $w_{o}$

$x_{t}-x_{r}=\frac{1}{2}*(w_{o}-w_{f})*t$

$583.3-146.3=\frac{1}{2}*(105-0)*t$

$t=\frac{437rad}{105\frac{rad}{s}}=8.32s$

$t_{total}=8.32+2.2=10.52s$

c).

$w_{f}=w_{o}+a*t$

$0=105 rad/s+a*8.32s$

$a=\frac{105 rad/s}{8.32s}$

$a=12.62 \frac{rad}{s^2}$

7 0

3 years ago

Why are radio waves safer to humans than X- Rays

julsineya [31]

Answer:

Explanation:

Since X-rays are high (energy) frequency photons and radio waves are composed of low (energy) frequency photons, X-rays are more energetic and can do more harm to organic materials (such as cells).

3 0

3 years ago

A car travelling at 40 m/s comes to a halt in 8 seconds. What is the car’s acceleration and how far does it travel while it is s

IrinaVladis [17]

Answer: Acceleration = 5m/s^2; Distance traveled = 320 m

Explanation:

Velocity of car = 40m/s

Time taken = 8 seconds

Acceleration = ?

Distance traveled = ?

A) Since acceleration is the rate of change of velocity per unit time

i.e acceleration = velocity / time

acceleration = 40m/s / 8 seconds

Acceleration = 5m/s^2

B) To get how far the car traveled before stopping, obtain the distance from the formula:

velocity = distance traveled / time

40m/s = distance / 8 seconds

Distance = 40m/s x 8 seconds

Distance = 320 m

Thus, the car’s acceleration is 5m/s^2 while it traveled 320 metres before stopping.

7 0

3 years ago