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The resting potential of the crab limb nerve is 89 mV. What is the
concentration of potassium ions inside the nerve, if it is 12mmol/1 outside?
Take the temperature equal to 20°C
An object which is electrically neutral contains only neutrons.
the earth pulling down on a 12kg rock during the 3.0s it takes to fall a cliff?
Calculate the mass of a steel plate with a specific heat capacity of 650 J/kg °C, taking into
consideration the steel plate was heated up with a cutting torch while cutting to 925 °C, and was
quenched in 25 It of water with an initial temperature of 22 °C and a specific heat capacity of
3850 J/kg °C. Both the water and the steel plate reached a final temperature of 32 °C. Here we
assume that there was no heat loss. Indicate what info was given, show all formulas and steps.
A basketball floats in a bathtub of water.
The ball has a mass of 0.5 kg and a diameter of 22 cm.
(a) What is the buoyant force?
(b) What is the volume of water displaced by the ball?
(c) What is the average density of the basketball?
You can use
g
= 9
.
8 m/s
2
.
An aluminum cylinder has a volume of 60 mL. Calculate the buoyant force that will be exerted on the cylinder when it is immersed in alcohol density = 0.78g/mL
2.) 20J of work are required to move 2.0C of charge between two points in an electric field. a.)Find the electric potential difference between the two points.
3.)How much work would be required to move 5.0C of charge between the same two points of the problem above?
What is the total electric flux through a closed surface containing a 2.0 μC charge?
Find the energy required to convert a 1 g cube of ice at
30°C to steam at 120°C
A girl sits at a distance of 12.0 m from the axis of merry-go-round in an amusement park. If the merry-go-round makes 3 rev
in 12 Os find the (a) tangential speed and (b) centripetal acceleration of the child.
