d. lower frequencies and low energy.
Explanation:
Microwaves and infrared waves are lower frequencies and lower energy waves.
They are both non-ionizing radiation.
- Microwaves and infrared waves are both electromagnetic waves.
- They do not require a material medium to be propagated in nature.
- They have little energy because the have very low frequency.
- They also have very long wavelengths.
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Answer:
75 Newtons.
Explanation:
From Newton's second law of motion,
F = m(v-u)/t................... Equation 1
Where F = force exerted by the ball on the bat, m = mass of the ball, v = final velocity of the ball, u = initial velocity of the ball, t = time
Given: m = 0.6 kilogram, u = 0 meter per seconds (at rest), v = 25 meters per seconds, t = 0.2 seconds.
Substitute into equation 1
F = 0.6(25-0)/0.2
F = 3(25)
F = 75 Newton.
Hence the magnitude of the average force exerted by the ball on the bat = 75 Newtons.
Answer:
<em><u>Solid</u> is the state in which matter maintains a fixed volume and shape; liquid is the state in which matter adapts to the shape of its container but varies only slightly in volume; and gas is the state in which matter expands to occupy the volume and shape of its container.</em>
Explanation:
Given that,
Orginal speed, u = 10,000 m/s
Final speed, v = 5,000 m/s
Time, t = 60 s
To find,
Acceleration of the satellite.
The acceleration of an object is equal to the change in its speed divided by time. So,
So, the acceleration of the satellite is 
and it is deaccelerating.
Answer: common velocity V = 4 m/s
Explanation:
Given that a 100 kg train traveling at 20 m/s crashes into a stationary 400 kg car.
Since both of them were stuck together after collision, the collision is inelastic.
The formula for inelastic collisions is:
M1U1 + M2U2 = ( M1 + M2 )V
We are told that the second car is stationary.
Therefore, U2 = 0
This will reduce the equation to:
M1U1 = (M1 + M2)V
Where V = common final velocity
M1 = 100 kg
M2 = 400 kg
U1 = 20 m/s
U2 = 0
Substitute all the parameters into the equation
100 × 20 = ( 100 + 400 ) V
2000 = 500V
Make the V the subject of formula
V = 2000/500
V = 4 m/s
