In this problem, only the following pair of sentences describe people with same velocity: Valerie rides her bike south at 8 kilometers per hour. Owen jogs south at 8 kilometers per hour. In fact, both Valerie and Owen are moving at same speed (8 km per hour) in the same direction (south), so they have same velocity.
30 km/h * 17 h = 30*17 km/h *h
= 510 km
The average current passing through a device is given by:
I = Q/Δt
I is the average current
Q is the amount of charge that has passed through the device
Δt is the amount of elapsed time
Given values:
Q = 4.00C
Δt = 4.00hr = 14400s
Plug in the values and solve for I:
I = 4.00/14400
I = 0.000277777778A
I = 0.278mA
Answer:
6. Acceleration = 4.74 m/s^2
7. Centripetal force = 40.5 N
Explanation:
Problem 6.
Recall that the centripetal acceleration is defined as: , where V is the object's tangential velocity, and r the radius of the circular motion. Therefore, in or case, the centripetal acceleration would be:
which we can round to 4.74 m/s^2 (option b in your list)
Problem 7.
Now we need to find not just the centripetal acceleration using the same formula as above, but then the centripetal force.
Now we calculate the centripetal force by multiplying this acceleration times the mass of the object following the definition of force as mass times acceleration:
Centripetal force = 5.0 kg * 8.1 m/s^2 = 40.5 N
The answers comes in Newtons (N)
Answer:
-90.8 Joules
Explanation:
A = Area of container = 50 cm²
d = Length pushed = 15 cm
P = External Pressure = 121 kPa
Change in volume
Work done
Work done by the system is -90.8 Joules