Answer:
d = 4 d₀o
Explanation:
We can solve this exercise using the relationship between work and the variation of kinetic energy
W = ΔK
In that case as the car stops v_f = 0
the work is
W = -fr d
we substitute
- fr d₀ = 0 - ½ m v₀²
d₀ = ½ m v₀² / fr
now they indicate that the vehicle is coming at twice the speed
v = 2 v₀
using the same expressions we find
d = ½ m (2v₀)² / fr
d = 4 (½ m v₀² / fr)
d = 4 d₀o
Answer:
<h3>The answer is 5.4 kg</h3>
Explanation:
The mass of the object can be found by using the formula
![m = \frac{f}{a} \\](https://tex.z-dn.net/?f=m%20%3D%20%20%5Cfrac%7Bf%7D%7Ba%7D%20%20%5C%5C%20)
f is the force
a is the acceleration
From the question we have
![m = \frac{135}{25} = \frac{27}{5} \\](https://tex.z-dn.net/?f=m%20%3D%20%20%5Cfrac%7B135%7D%7B25%7D%20%20%20%3D%20%20%5Cfrac%7B27%7D%7B5%7D%20%5C%5C%20)
We have the final answer as
<h3>5.4 kg</h3>
Hope this helps you
Heat used by electric heater :
Q = m • c • ∆T
Q = (75 kg)(4200 J/kg°C)(43°C - 15°C)
Q = 8.82 × 10⁶ J
Cost of electrical energy :
Cost = (8.82 × 10⁶ J)/(3.6 × 10⁶ J) • ($ 0.15)
Cost = $ 0.3675
Answer:B
Explanation:
Given
mass of Sled is m
another package of mass m is thrown on it
Suppose u be the initial velocity of sled
conserving momentum
![mu=2mv](https://tex.z-dn.net/?f=mu%3D2mv)
![v=\frac{u}{2}](https://tex.z-dn.net/?f=v%3D%5Cfrac%7Bu%7D%7B2%7D)
where v is the final velocity
Initial kinetic energy ![=\frac{1}{2}mu^2](https://tex.z-dn.net/?f=%3D%5Cfrac%7B1%7D%7B2%7Dmu%5E2)
Final Kinetic Energy![=\frac{1}{2}(2m)\cdot (\frac{u}{2})^2](https://tex.z-dn.net/?f=%3D%5Cfrac%7B1%7D%7B2%7D%282m%29%5Ccdot%20%28%5Cfrac%7Bu%7D%7B2%7D%29%5E2)
Final Kinetic Energy![=\frac{1}{2}\times \frac{1}{2}mu^2](https://tex.z-dn.net/?f=%3D%5Cfrac%7B1%7D%7B2%7D%5Ctimes%20%5Cfrac%7B1%7D%7B2%7Dmu%5E2%20)
Final kinetic Energy is half of initial
Analog
Television transmitters use one of two different technologies: analog, in which the picture and sound are transmitted by analog signals modulated onto the radio carrier wave, and digital in which the picture and sound are transmitted by digital signals.