Answer:
-3.5m/s²
Explanation:
Given
Initial Velocity, u = 30m/s
Final Velocity, v = 23m/s
Time, t = 2.0s
Required
Determine the magnitude of acceleration
This is calculated using first equation of motion.
v = u + at
Substitute values for v, u and t
23 = 30 + a * 2.0
23 = 30 + 2.0a
23 - 30 = 2.0a
-7 =2.0a
Solve for a
a = -7 ÷ 2.0
a = -3.5m/s²
True.
Density = mass / volume, Unit = g / cm³.
This is a common unit because of its affiliation with the SI unit and because that also our popular liquid which is water = 1 g/cm³
Answer:
s = 2.16 x 10¹¹ m
Explanation:
Since, the waves travelling from Earth to the Mars rover are electromagnetic. Therefore, there speed must be equal to the speed of light. So, from the equation given below:
s = vt
where,
s = the distance between Earth and Mars = ?
v = speed of the wave = speed of light = 3 x 10⁸ m/s
t = time taken by the radio signals to reach the rover from Earth
t = (12 min)(60 s/1 min) = 720 s
Therefore,
s = (3 x 10⁸ m/s)(720 s)
<u>s = 2.16 x 10¹¹ m</u>
Answer:
Option C
Explanation:
From the question we are told that:
Mass ![m=0.015kg](https://tex.z-dn.net/?f=m%3D0.015kg)
Radius ![r=0.5m](https://tex.z-dn.net/?f=r%3D0.5m)
Time ![t=0.70](https://tex.z-dn.net/?f=t%3D0.70)
Generally the equation for Tension is mathematically given by
![T=\frac{4mr}{t^2} \pi](https://tex.z-dn.net/?f=T%3D%5Cfrac%7B4mr%7D%7Bt%5E2%7D%20%5Cpi)
![T=\frac{4*0.015*0.5}{(0.70)^2} (3.142)](https://tex.z-dn.net/?f=T%3D%5Cfrac%7B4%2A0.015%2A0.5%7D%7B%280.70%29%5E2%7D%20%283.142%29)
![T=0.60N](https://tex.z-dn.net/?f=T%3D0.60N)
Therefore
, toward the center of the circle
Option C
how do I answer this question for you?
where is the button