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A potential difference of 250V is applied to a field winding at 15°C and the current is 5A. What will the temperature of the winding when current has fallen to 3.91A, applied voltage being constant. Assume delta15=0.00393/°C
A platinum coil has a resistance of 3.146ohms at 40°C and 3.767 ohms at 100°C. Find the resistance at 0°C and the temperature coefficient of resistance at 40°C
as an archeologist, what are the significant data that we can obtain from grasping ideas from the connection of extinct organism to the organisms in our present time
how much total interest will molly pay using this plan
A teacher wants to know if listening to KPop music
affects the performance of his students in mathematics. A
class of 30 students were selected in the experiment. The
mean score was 81 and the standard deviation is 5. A
previous study revealed that u = 80 and the standard
deviation is 8. State the null and alternative hypothesis in
words and symbols
31.3 L of concentrated nitric acid (8.50 mol L-1) was spilled on a road. Sodium carbonate solid was spread on the acid to react as in the equation:
CO32-(aq) + 2H+ → CO2(g) + H2O
How many grams of sodium carbonate are needed to neutralise the acid?
A student needs to react 0.282 mol Zn with hydrochloric acid. Calculate the minimum number of moles of HCl required, assuming all the zinc reacts?
How many grams of water could be heated from 00C to 1000C by the heat released per mole of aluminum oxide formed by the thermite reaction.
Calculate the heat of burning ethane (C2H6) in oxygen to give CO2 and water vapor.
What is the minimum energy required to synthesize sulfur dioxide from sulfuric acid?
Two parallel straight wires 10.0 cm apart carry currents in opposite directions (Fig. 20–24). Current I_1=5.0 A is out of the page, and I_2=7.0 A is into the page. Determine the magnitude and direction of the magnetic field halfway between the two wires.
1) The Cobb-Douglas production function is
y=z1αz2β
, with
α>0
and
β>0
. Show that
MP1=αy/z1
,
MP2=βy/z2
. What is the
MRTS21
? How does it vary with: (a) y; (b)
z2/z1
.
#339914 on Dec 2023