Answer:
1.97J
Explanation:
Given parameters:
Mass of the groceries = 7kg
velocity of the bag = 75cm/s
Unknown:
Work done to move the bag = ?
Solution:
Work done is the force applied to move a body through a distance in a specific direction:
Work done = Force x distance
In this case, the work done is the kinetic energy applied in pulling the bag.
Kinetic energy is the energy in motion of a body.
Work done = kinetic energy = 
where m is the mass
v is the velocity
Now, convert the velocity from cm/s to m/s
100cm = 1m
75
x 
= 0.75m/s
Work done = 
x 7 x 0.75² = 1.97J
Answer:
(B) Joules per second
Explanation:
Power is the amount of work done per unit of time. Since work is measured in Joules, the SI unit of power is Joules per second (J/s), or Watts (W).
Of course, the cooler unit of power is the Horsepower (hp), originally introduced by James Watt himself, using which people nowadays still boast about their favorite car's "strength."
The magnitude of the angular acceleration of the magnetic disk is determined as 35 rad/s².
<h3>
Angular acceleration of the disk</h3>
The angular acceleration of the disk is determined from the principle of conservation of angular momentum as follows;
τ = Iα
where;
α is angular acceleration
I is moment of inertia of the disk
I = 0.5MR²
I = 0.5 x 0.2 x 2²
I = 0.4 kgm²
τ = Iα
α = τ/I
α = (14)/(0.4)
α = 35 rad/s²
Learn more about angular acceleration here: brainly.com/question/21278452
#SPJ1
Answer: H2O2
Explanation:
First, calculate the moles of H2O2 reacting. In order to do this, we must evaluate the relative molecular mass ( Mr ) of hydrogen peroxide
One example would be that of an Eclipse. It is an astronomical event that occurs when an astronomical object is temporarily obscured, either by passing into the shadow of another body or by having another body pass between it and the viewer. ( Like when the moon's shadow crosses the earth's surface you get a solar eclipse.)
Another example would be a year. A year is the orbital period of the Earth moving in its orbit around the Sun.
