An old building is being demolished by swinging a heavy metal ball from a crane. Suppose that such a 115kg ball swings from a 20
-m-long wire at speed 12m/s as the wire passes the vertical orientation.
a) What tension force must the wire be able to withstand in order not to break?
b)Assume the ball stops after sinking 1.5 m into the wall. What was the average force that the ball exerted on the wall?
a) What tension force must the wire be able to withstand in order not to break?
b)Assume the ball stops after sinking 1.5 m into the wall. What was the average force that the ball exerted on the wall?
1 answer:
You might be interested in
Answer:
a) It moved to a lower potential
b) ΔФ = - 86.28 Volt
Explanation:
The energy of an charged particle and the electric potential are related by the potential al kinetic energies:
If we consider an electron:
m = 9.10938*10^-31 Kilogram
e = 1.60218*10^-19 Coulomb
And the potential diference may be calculed by:
Replacing all the values we get:
ΔФ = - 86.28 (Kilogram Meter^2)/(Coulomb Second^2) = -86.28 Volts
Answer:
1.31*10⁻²⁰ J
Explanation:
- As the potential is the work per unit charge, we can find the work done by the electric field created by the charge, just multiplying the potential difference times the charge acted by the field.
- A singly ionized potassium ion has a charge equal to a positive elementary charge, e.
- So, the work done by the field can be found as follows:
- where e = 1.6*10⁻¹⁹ C and V= 82 mV
- Replacing by the values, we finally get:
- The magnitude of the work done by the electric field of the membrane is 1.31*10⁻²⁰ J