Answer:
Both use reflected sound waves.
Answer:
25 m/s
Explanation:
From the question,
The vertical component of the initial velocity of the base ball assuming up is positive, is given as
Vv = VsinФ................... Equation 1
Where Vv = Vertical component of the initial velocity of the base ball, V = Initial velocity of the base ball, Ф = Angle of inclination with the horizontal.
Given: V = 50 m/s, Ф = 30°
Substitute into equation 1
Vv = 50sin30°
Vv = 50(0.5)
Vv = 25 m/s.
Hence the vertical component of the initial velocity = 25 m/s
2.Reducing the friction between the wagon wheels
3.Reducing the length of the wagon handle
4.Increasing the friction between the wagon wheels
Answer:
2.Reducing the friction between the wagon wheels
Explanation:
If the friction between the wagon wheels and the rail is reduced, then less force will be needed to pull the wagon up. This is because the friction force goes in the opposite direction of the movement, that is, friction force opposes the desired movement, making it more difficult.
Answer:
Explanation:
Sun is the only source of heat on earth. Heat from sun first passes through atmosphere and then fall on the earth's surface i.e. land and ocean.
Condensation, Radiation, Convection, Conduction transfers heat within the atmosphere and ocean such as rise of hot air, cooling and then falling is the example of convection whereas, heat from fire is the example of radiation.