Answer:
Part a)
acceleration = -0.042 m/s/s
Part b)
initial speed = 14.17 m/s
final speed = 5.77 m/s
Explanation:
Part a)
Let the initial velocity of the motorcycle is
![v_i = v_o](https://tex.z-dn.net/?f=v_i%20%3D%20v_o)
now at the end of 80 s let the speed is
![v_f = v_1](https://tex.z-dn.net/?f=v_f%20%3D%20v_1)
after another 120 s let the speed will be
![v_f' = v_2](https://tex.z-dn.net/?f=v_f%27%20%3D%20v_2)
now we know that
![d = \frac{v_i + v_f}{2} (t)](https://tex.z-dn.net/?f=d%20%3D%20%5Cfrac%7Bv_i%20%2B%20v_f%7D%7B2%7D%20%28t%29)
![d = \frac{v_o + v_1}{2}(80)](https://tex.z-dn.net/?f=d%20%3D%20%5Cfrac%7Bv_o%20%2B%20v_1%7D%7B2%7D%2880%29)
![1000 = 40(v_o + v_1)](https://tex.z-dn.net/?f=1000%20%3D%2040%28v_o%20%2B%20v_1%29)
also we know that
![v_1 - v_o = a(80)](https://tex.z-dn.net/?f=v_1%20-%20v_o%20%3D%20a%2880%29)
also we have
![1000 = \frac{v_1 + v_2}{2}(120)](https://tex.z-dn.net/?f=1000%20%3D%20%5Cfrac%7Bv_1%20%2B%20v_2%7D%7B2%7D%28120%29)
![1000 = 60(v_1 + v_2)](https://tex.z-dn.net/?f=1000%20%3D%2060%28v_1%20%2B%20v_2%29)
now we can say
![(v_2 + v_1) - (v_o + v_1) = \frac{50}{3} - \frac{50}{2}](https://tex.z-dn.net/?f=%28v_2%20%2B%20v_1%29%20-%20%28v_o%20%2B%20v_1%29%20%3D%20%5Cfrac%7B50%7D%7B3%7D%20-%20%5Cfrac%7B50%7D%7B2%7D)
also we know
![v_2 - v_o = a(120 + 80)](https://tex.z-dn.net/?f=v_2%20-%20v_o%20%3D%20a%28120%20%2B%2080%29)
![-8.33 = 200 a](https://tex.z-dn.net/?f=-8.33%20%3D%20200%20a)
![a = -0.042 m/s^2](https://tex.z-dn.net/?f=a%20%3D%20-0.042%20m%2Fs%5E2)
Part b)
now we have
![v_1 + v_o = 25](https://tex.z-dn.net/?f=v_1%20%2B%20v_o%20%3D%2025)
![v_1 - v_o = (-0.042)(80)](https://tex.z-dn.net/?f=v_1%20-%20v_o%20%3D%20%28-0.042%29%2880%29)
![v_1 = 10.83 m/s](https://tex.z-dn.net/?f=v_1%20%3D%2010.83%20m%2Fs)
so the starting velocity of the trip is
![v_o = 25 - 10.83 = 14.17 m/s](https://tex.z-dn.net/?f=v_o%20%3D%2025%20-%2010.83%20%3D%2014.17%20m%2Fs)
now speed after t = 200 s is given as
![v_2 = v_o + at](https://tex.z-dn.net/?f=v_2%20%3D%20v_o%20%2B%20at)
![v_2 = 14.17 - (0.042)(200)](https://tex.z-dn.net/?f=v_2%20%3D%2014.17%20-%20%280.042%29%28200%29)
![v_2 = 5.77 m/s](https://tex.z-dn.net/?f=v_2%20%3D%205.77%20m%2Fs)
A chemical reaction is the process in which atoms present in the starting substances rearrange to give new chemical combinations present in the substances formed by the reaction. These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.
Higher frequencies are present in more dramatic events and have thus been the first to be noticed, but the frequencies of ordinary gravitational waves are relatively low and considerably more difficult to detect.
A gamma-ray burst (GRB), which was discovered by the orbiting Fermi gamma-ray burst monitor on 2017 August 17 at 12:41:06 UTC, triggered an automatic notice throughout the world in addition to a merger of black holes. Six minutes later, a gravitational-wave observatory in Hanford, Washington, detected a gravitational-wave candidate that occurred 2 seconds before the gamma-ray explosion.
This collection of data supports the merger of two neutron stars, as shown by a multi-messenger transient event that was detected by gravitational waves as well as electromagnetic (gamma-ray burst, optical, and infrared) spectrum observations.
learn more about gamma rays: brainly.com/question/16116092
#SPJ4
Answer: ![6.05\cdot 10^7 J](https://tex.z-dn.net/?f=6.05%5Ccdot%2010%5E7%20J)
Explanation:
Energy is related to power by:
![E=Pt](https://tex.z-dn.net/?f=E%3DPt)
where P is the power and t is the time. In this problem, we have:
![P=16.8 kW=16800 W](https://tex.z-dn.net/?f=P%3D16.8%20kW%3D16800%20W)
![t=1 h=3600 s](https://tex.z-dn.net/?f=t%3D1%20h%3D3600%20s)
So, the energy used in one hour is
![E=(16800 W)(3600 s)=6.05\cdot 10^7 J](https://tex.z-dn.net/?f=E%3D%2816800%20W%29%283600%20s%29%3D6.05%5Ccdot%2010%5E7%20J)
Answer:
1. non-luminous objects
sorry have to say the rest in the comments because brai.nly is doing the most for no reason
Explanation:
hope this helps sorry if it doesn't have a good rest of your day/afternoon :) ❤