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Sladkaya [172]
2 years ago
4

a cricket ball is hit so that it travels straight up in the air and it require 3 second to reach the maximum height its initial

velocity is
Physics
1 answer:
Lisa [10]2 years ago
0 0

Answer:

v = u - gt

At maximum heitht, v = 0

0 = u - (9.8)(3)

u = 29.4 m/s initial velocity

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When an ambulance with its siren on is moving away from you, the wavelength of the sound gets _______ and the pitch of the sound
WINSTONCH [101]

Answer:

I think its B

Explanation:

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7 0
1 year ago
An 85 kg object is moving at a constant speed of 15 m/s in a circular path, which has a radius of 20 meters. What centripetal fo
elena55 [62]
Mass, m = 85 kg, velocity = 15 m/s, radius = 20m.

Centripetal force = mv²/r

F = 85*15²/20 =  85*15*15/20 = 956.25 N
3 0
2 years ago
Establish the dimension of density​
mario62 [17]
Dimensional Formula of Density
The dimensional formula of density is given by,

[M1 L-3 T0]
Where,

M = Mass
L = Length
T = Time
Derivation

Density (ρ) = Mass × Volume-1 . . . . . (1)

The dimensional formula of volume = [M0 L3 T0] . . . . (2)

And, the dimensional formula of mass = [M1 L0 T0] . . . . (3)

On substituting equation (2) and (3) in equation (1) we get,

Density = Mass × Volume-1

Or, (ρ) = [M1 L0 T0] × [M0 L3 T0]-1 = [M1 L-3 T0]

Therefore, density is dimensionally represented as [M1 L-3 T0].

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5 0
2 years ago
Read 2 more answers
Write down the equation that links energy transferred, power and time.
BartSMP [9]

Answer:

Power = Energy transferred / time

Explanation:

6 0
2 years ago
A dynamite blast at a quarry launches a rock straight upward, and 2.4 s later it is rising at a rate of 10 m/s. assuming air res
vodka [1.7K]
Let u = the vertical speed at launch, m/s
g = 9.8 m/s², acceleration due to gravity.

Part (a)
After 2.4 s, the vertical speed is 10 m/s.
Therefore
(10 m/s) = (v ft/s) - (9.8 m/s²)*(2.4 s)
v = 10 + 9.8*2.4 = 33.52 m/s

Answer: 33.52 m/s upward

Part (b)
After 5.1 s, the vertical speed is
(33.52 m/s) - (9.8 m/s²)*(5.1 s) = -16.46 m/s.
This means that the rock reached the maximum height and began falling downward.

Answer: 16.46 m/s downward
7 0
2 years ago
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