Answer:
44.8 m/s
Explanation:
Use the Initial Speed Formula:
InS = 2(d/t) - Final Speed
InS = 2(55/1,25) - 43.2
InS = 2.44 - 43,2
InS = 88 - 43,2
InS = 44.8 m/s
Answer:
The age of the rock is years
Explanation:
We can write the formula for the quantity of material in an exponential decay as:
where is the initial quantity of the material, and is the mean lifetime of the material.
This means that the total material that has decayed is:
The mean lifetime can be obtained from the half-life ( ) by the relationship
For our problem, as there was no Sr-87 present in the rock initially, and its a product of the decay, its abundance will be given by , this means, the total quantity of material that has decayed.
So, our equation for the ratio will be
Working it a little
The half-life of the problem is
So, the age of the rock will be
H=k+log(a/c)
H-k = log(a/c)
e^{h-k}=a/c
a = ce^{h-k}
Answer: Yes
The capacitor in an RC circuit (Resistor-Capacitance circuit) creates a time delay that decays exponentially. Therefore when the voltage to the bulb is removed, it takes a long time for the capacitor to completely discharge.
Although the brightness of the bulb will diminish as the capacitor discharges, the bulb will still be lit until the capacitor discharges to a voltage that is too low to sustain visible light (to the human eye) from the bulb.
Answer:
The resting membrane potential is the voltage across the membrane of a resting or non- signalling neuron.The resting potential is determined by concentration gradients of ions across the membrane and by membrane permeability to each type of ion.
The resting membrane potential of a neuron is about -70 mV (mV=millivolt) - this means that the inside of the neuron is 70 mV less than the outside. At rest, there are relatively more sodium ions outside the neuron and more potassium ions inside that neuron.