Only light can travel through empty space, as sound is a vibration that uses a medium such as air to travel through. Electromagnetic waves do not need a medium.
Given Data: Diameter 'd' = 30 cm = 0.3 m Lifting Weight 'W' = mg = 2000*9.81 N = 19,620 N Calculations: Area of the lift 'A' = <span>pi\over4*d^2=pi\over4*0.3^2=0.07 m^2
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Answer:
12.32 m/s
Explanation:
Using the formula of maximum height of a projectile,
H = u²sin²Ф/2g................... Equation 1
Where H = maximum height, u = initial velocity, Ф = angle of projection, g = acceleration due to gravity
make u the subject of the equation
u = √(2Hg/sin²Ф)............ Equation 2
Given: H = 2.3 m, Ф = 33°, g = 9.8 m/s²
Substitute into equation 2
u = √[(2×2.3×9.8)/sin²33°]
u =√ [45.08/(0.545)²]
u = 45.08/0.297
u = √(151.785)
u = 12.32 m/s
32miles/hr
Explanation:
Given parameters:
Distance 1 = 60miles
Time 1 = 2hrs
Distance 2 = 68miles
Time 2 = 2hrs
Unknown:
Average speed of the car = ?
Solution:
Average speed is the total distance covered in a particular duration of time.
Average speed =
Total time taken = time 1 + time 2 = 2hrs + 2hrs = 4hrs
Total distance = distance 1 + distance 2 = 60miles + 68miles = 128miles
Average speed = = 32miles/hr
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