A child on a spinning ride at a playground has a centripetal acceleration of 0.80 m/s2. The child completes a full circle every
2 answers:
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Answer:
a.
b.
Explanation:
The force existing between two charges is given as
where q= charge,
k=constant
r= distance between the two charges
Note: this force can either be repulsive or attractive force depending on the charges involve. it is repulsive if they are similar charge and it is attractive if it is opposite charges.
Also the charge of an electron is
A. we first determine the magnitude force between the -4nC and the electron
this force will be repulsive force and it points away from the electron i.e points towards the +ve x-axis
for the -5.50nC the distance between them is 0.600m as can be seen in the diagram the magnitude of the force is
this this force will be repulsive force and it points away from the electron i.e points towards the -ve x-axis.
The total net force on the electron is thus
b. at distance of x=1.20m, this is shown on the diagram below (attachment 2)
we first determine the magnitude force between the -4nC and the electron
this force will be repulsive force and it points away from the electron i.e points towards the +ve x-axis.
for the -5.50nC the distance between them is 0.4m as can be seen in the diagram the magnitude of the force is
this this force will be repulsive force and it points away from the electron i.e points towards the +ve x-axis.
The total net force on the electron is thus
Answer:
correct option is c. 31.0°C
Explanation:
given data
copper of mass = 100 g
electric drill = 1/2"
power = 40.0 W
time = 30 s
C copper = 387 J/kgC
to find out
copper's increase in temperature
solution
we get here energy that is express a s
energy = 40 W × 30 s
energy = 1200 Watt seconds
and heat acquired by drill is here as
heat acquired = 100 × T × 387
here temperature rise in copper mass as
temperature rise in copper mass = × T × 387
temperature rise in copper mass = 38.7 × T Watt second
we know that all the energy from the drill heats the copper
so we can say
38.7 × T = 1200
T = 31°C
so correct option is c. 31.0°C
Answer:
degrees
Explanation:
Eels have been recorded to spin at up to 14 revolutions per second when feeding in this way
So the angle the eel rotate is going to be
Camera record 120 frames per second
time taken for 1 frame record
eel rotates
degrees in 1 second
so:
eel rotetas degrees