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4 years ago

As seen from above, a playground carousel is

Physics

1 answer:

Vadim26 [7]4 years ago

4 0

Answer:

The final angular speed of the carousel is 1.68 rad/s.

Explanation:

This is simply a conservation of angular momentum problem.

$\vec{L}_0 = \vec{L}_1\\L_0 = I_0\omega_0 = 125*3.14 = 392.5\\L_1 = I_1\omega_1 = (mR^2 + I_0)\omega_1 = (48*1.5^2 + 125)\omega_1 = 233\omega_1$

Combining the two equations yields the angular momentum of the carousel after the man climbs.

$392.5 = 233\omega_1\\\omega_1 = 1.68~rad/s$

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The overall energy involved in the formation of CsCl from Cs(s) and Cl2(g) is −443 kJ/mol. Given the following information: heat

german

Answer : The magnitude of the lattice energy for CsCl is, 667 KJ/mole

Explanation :

The steps involved in the born-Haber cycle for the formation of $CsCl$ :

(1) Conversion of solid calcium into gaseous cesium atoms.

$Cs(s)\overset{\Delta H_s}\rightarrow Cs(g)$

$\Delta H_s$ = sublimation energy of calcium

(2) Conversion of gaseous cesium atoms into gaseous cesium ions.

$Ca(g)\overset{\Delta H_I}\rightarrow Ca^{+1}(g)$

$\Delta H_I$ = ionization energy of calcium

(3) Conversion of molecular gaseous chlorine into gaseous chlorine atoms.

$Cl_2(g)\overset{\frac{1}{2}\Delta H_D}\rightarrow Cl(g)$

$\Delta H_D$ = dissociation energy of chlorine

(4) Conversion of gaseous chlorine atoms into gaseous chlorine ions.

$Cl(g)\overset{\Delta H_E}\rightarrow Cl^-(g)$

$\Delta H_E$ = electron affinity energy of chlorine

(5) Conversion of gaseous cations and gaseous anion into solid cesium chloride.

$Cs^{1+}(g)+Cl^-(g)\overset{\Delta H_L}\rightarrow CsCl(s)$

$\Delta H_L$ = lattice energy of calcium chloride

To calculate the overall energy from the born-Haber cycle, the equation used will be:

$\Delta H_f^o=\Delta H_s+\Delta H_I+\Delta H_D+\Delta H_E+\Delta H_L$

Now put all the given values in this equation, we get:

$-443KJ/mole=76KJ/mole+376KJ/mole+121KJ/mole+(-349KJ/mole)+\Delta H_L$

$\Delta H_L=-667KJ/mole$

The negative sign indicates that for exothermic reaction, the lattice energy will be negative.

Therefore, the magnitude of the lattice energy for CsCl is, 667 KJ/mole

5 0

4 years ago

A pomegranate is thrown from ground level straight up into the air at time t=0 with velocity 240 feet per second. Its height in

3241004551 [841]

Answer:

a) $t=15 s$

b) $t=7.5s$

c) $f(t)=900ft$

Explanation:

From the exercise we have the equation of height and the initial velocity of the pomegranate

$f(t)=240t-16t^{2}$

a)To find the time that it hits the ground we know that its position is 0

$0=240t-16t^{2}$

Solving for t using quadratic equation

$t=\frac{-b±\sqrt{b^{2}-4ac } }{2a}$

$a=-16\\b=240\\c=0$

$t=0s$ or $t=15s$

Since time can not be 0, the answer is t=15s

b) To find the time that it reaches its highest point we need to analyze the velocity at that time

$v=\frac{df}{dt}$

$\frac{dt}{dt}=240-32t$

At the highest point its velocity is 0

$0=240-32t$

$t=\frac{240ft/s}{32ft/s^{2} }=7.5s$

c) To find the maximum height we need to use f(t) with t=7.5

$f(t)=240(7.5)-16(7.5)^{2}=900ft$

6 0

4 years ago

Wearing a seat belt protects you from possible harm by a certain force. Which force?

svlad2 [7]

Answer:

push

Explanation:

it pushes you back when you lean forward really fast

The difference between mass and weight is that mass is the amount of matter in a material, while weight is a measure of how the force of gravity acts upon that mass. Mass is the measure of the amount of matter in a body. ... Weight usually is denoted by W. Weight is mass multiplied by the acceleration of gravity (g).

GRAVITY

THE UNBALANCED FORCE THAT CAUSES OBJECTS TO MOVE IN A CIRCULAR PATH IS CALLED A CENTRIPETAL FORCE. GRAVITY PROVIDES THE CENTRIPETAL FORCE THAT KEEPS OBJECTS IN ORBIT. THE WORD CENTRIPETAL MEANS "TOWARD THE CENTER."

8 0

3 years ago

Jordan exercises one to two times a week. She usually works out alone. Between meals, she sometimes snacks on potato chips from

tamaranim1 [39]

C I think I (hope this Helps)

8 0

3 years ago

Question 7 of 20

ch4aika [34]

Answer:

Explanation:

because she is thermal energy