Between which of the following surfaces would the force of friction be

Find the distance covered by a car in 10 second, if it is moving at the speed of 20m/s

labwork [276]

Answer:

solution

we know that .

s=ut+½at²

now, putting the values in the second equation of motion ,

we get,

S=20×10+1/2×(10)²

S=200+1×100

S=200+100

S=300m

the distance covered by given body or object in 10 seconds is 300 m.

8 0

3 years ago

Measurements show that the enthalpy of a mixture of gaseous reactants decreases by during a certain chemical reaction, which is

snow_tiger [21]

The given question is incomplete. The complete question is as follows.

Measurements show that the enthalpy of a mixture of gaseous reactants decreases by 338 kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that 187 kJ of work is done on the mixture during the reaction. Calculate the change in energy of the gas mixture during the reaction. Be sure your answer has the correct number of significant digits. Is the reaction exothermic or endothermic ?

Explanation:

The given data is as follows.

Change in enthalpy ( $\Delta H$ ) = -338 kJ (as it is a decrease)

Work done = 187 kJ,

Change in energy ( $\Delta E$ ) = ?

Now, according to the first law of thermodynamics the formula is as follows.

$\Delta H = \Delta E + P \Delta V$

Hence, putting the given values into the above formula as follows.

$\Delta H = \Delta E + P \Delta V$

Also, we know that W = $P \Delta V$

so, $\Delta H = \Delta E + W$

$-338 kJ = \Delta E + 187$

$\Delta E$ = -151 kJ

Thus, we can conclude that the change in energy of the gas mixture during the reaction is -151 kJ.

5 0

3 years ago

How can you define a solution to an equation?

sleet_krkn [62]

A solution is a value or a collection of values.. when substituted for the unknowns, the equation become an equality.
Example : x + 2 = 7
When we out the 5 in place of x we get: 5 + 2 = 2

8 0

3 years ago

The acceleration of a particle is defined by the relation a 5 28 m/s2. Knowing that x 5 20 m when t 5 4 s and that x 5 4 m when

mamaluj [8]

Explanation:

It is given that,

The acceleration of a particle, $a=-8\ m/s^2$ (negative as the particle is decelerating)