Answer:
Explanation:
The momentum of an object is given by:
, where is the mass of the object and is the velocity of the object.
a)
The mass of the child and bike together is kilograms. Since they're moving at a velocity of 5.0 m/s, their momentum is:
.
b)
The mass of the child is given as 19 kg. Since the child is on the bike moving at 5.0 m/s, it's implied the child is as well. Therefore, the momentum of the child is:
.
c) The mass of the bike is given as 5.6 kg and it is moving at 5.0 m/s. Therefore, the momentum of the bike is:
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Answer: 7.71 grams
Explanation:
Half-life of strontium-90 = 28 years
First we have to calculate the rate constant, we use the formula :
Now we have to calculate the age of the sample:
Expression for rate law for first order kinetics is given by:
where,
k = rate constant =
t = age of sample = 174 years
a = initial amount of the reactant = 50 g
a - x = amount left after decay process = ?
Now put all the given values in above equation, we get
Thus amount left after 174 years is 7.71 grams.
Answer:
circuito paralelo
Explanation:
Siempre el circuito en paralelo dara una resistencia menor. Recuerda que las resistencias se suman en el circuito en serie, an cambio en el circuito en paralelo, la corriente se bifurca de manera de circular con mayor intensidad por las ramas que tengan menos resistencia, y tal situacion llevara siempre a producir una menor resistencia equivalente.
Answer:
Let's say a horse. In it's environment biotic factors such as predators and other animals that the horse competes with for food are limiting factors. Abiotic factors are the amounts of water, the temperature, and precipitation are also limiting factors.
Answer:
14.44 revolutions
Explanation:
unit conversion:
85mile/hour = 85mile/hour * 5280ft/mile * 1/3600hours/second = 448800ft/hour = 124.67 ft/s
1800rev/min = 1800rev/min * 1/60min/seconds = 30 rev/s
The time it takes for the 85mph base ball to travel 60 ft is
t = s/v = 60 / 124.67 = 0.4813 seconds
By that time, the number of revolution it would make is:
r = 30 * 0.4813 = 14.44 revolutions