Answer:
17.5 m
Explanation:
First of all, we need to find the time the arrow need to cover the horizontal distance between the starting point and the orange, which is
x = 49.0 m
We start by calculating the horizontal component of the arrow's velocity:
And this horizontal velocity is constant during the entire motion. So, the time taken to reach the horizontal position of the orange is
Now we can find the height of the arrow at that time by using the equation for the vertical position:
where:
h = 1.30 m is the initial height
is the initial vertical velocity
t = 1.57 s is the time
is the acceleration of gravity
Substituting into the equation, we find
Answer:
The ball slows down in the air due to an unbalanced force
Explanation:
When player kicks the ball, there are mainly two foces acting on this object: the force made by the player and the opposite force of gravity (which acts with a direction always to the centre of the Earth)
The force applied by the player will be decreasing, while the force of gravity is always constant, this will make that both forces will unbalance, making the football´s speed slow down
Gravity is cause by earth's atomoshrepe and it helps keep all living things, like u and me, from going into space and being dead
1) use energy from food
2) get rid of wastes
3) maintain
Answer:
A kilowatt (kW) is a unit of power.
Explanation:
The power of an object is given by :
Here,
E is the energy required
t is time
The SI unit of power is Watts and the SI unit of energy is Joule. the commercial unit of energy is kilowatt per hour.
Option (1) : A kilojoule (kJ) is a unit of power is incorrect.
Option (2) : A gigawatt (GW) is a unit of energy is incorrect.
Option (3) : A watt (W) is a unit of energy is incorrect.
Option (4) : A kilowatt x hour per year (kWh/yr) is a unit of energy is incorrect.
Option (4) : A kilowatt (kW) is a unit of power is correct.
Hence, the correct option is (d).
