Answer:
The ball will have a kinetic energy of 0.615 Joules.
Explanation:
Use the kinetic energy formula
The kinetic energy at the moment of leaving the hand will be 0.615 Joules. (From there on, as it ball is traveling upwards, this energy will be gradually traded off with potential energy until the ball's velocity becomes zero at the apex of the flight)
Answer: 43s
Explanation:
The stored energy across a plate can be measured by calculating the electric charge and the potential difference. Also, the quantity of electricity can be measured by multiplying the current in the circuit with the time taken.
Given
Potential difference, V = 120 v
Current, I = 11.5 A
Energy, E = 59 kJ
Remember,
E = QV, so that
Q = E/V
Q = 59000/120
Q = 491.67 C
Q = IT
491.67 = 11.5*t
t = 491.67/11.5
t = 42.75s ~ 43s
Time taken to cook the 3 hot dogs simultaneously is 43s
Answer: 7.5 ml
Explanation: Density= mass/ volume.
So, volume = mass / density
= 15g / 2 g/ml
= 7.5 ml
If the angle between the vector and the y-axis is Θ ,
then the y-component of the vector is
(length of the vector) times cosine( Θ ),
and the x-component of the vector is
(length of the vector) times sine( Θ ) .
Answer:
A.) 1372 N
B.) 1316 N
C.) 1428 N
Explanation:
Given that a 140 kg load is attached to a crane, which moves the load vertically. Calculate the tension in the cable for the following cases:
a. The load moves downward at a constant velocity
At constant velocity, acceleration = 0
T - mg = ma
T - mg = 0
T = mg
T = 140 × 9.8
T = 1372N
b. The load accelerates downward at a rate 0.4 m/s??
Mg - T = ma
140 × 9.8 - T = 140 × 0.4
1372 - T = 56
-T = 56 - 1372
- T = - 1316
T = 1316N
C. The load accelerates upward at a rate 0.4 m/s??
T - mg = ma
T - 140 × 9.8 = 140 × 0.4
T - 1372 = 56
T = 56 + 1372
T = 1428N
