Answer:
Option D - 0.2 s
Explanation:
We are given;
Initial velocity; u = 7 m/s
Height of table; h = 1.8m
Now,since we want to find the time the car spent in the air, we will simply use one of Newton's equation of motion.
Thus;
h = ut + ½gt²
Plugging in the relevant values, we have;
1.8 = 7t + ½(9.8)t²
4.9t² + 7t - 1.8 = 0
Using quadratic formula to find the roots of the equation gives us;
t = -1.65 or 0.22
We can't have negative t value, thus we will pick the positive one.
So, t = 0.22 s
This is approximately 0.2 s
Answer:yes because where I live a lot of people overdose from that mixture and they die
Explanation:
Period of an ideal simple pendulum = 2π √(L / G)
1.87 = 2π √ (L / 9.81)
Divide each side by 2π : (1.87 / 2π) = √ (L / 9.81)
Square each side: (1.87 / 2π)² = L / 9.81
Multiply each side by 9.81 : L = (9.81) (1.87 / 2π)² = <em> 0.869 meter</em>
Choice 'D' is the closest one.
You just told us that mass is 10 kg, acceleration of gravity is 9.8 m/s²,
and weight is their product, so we don't need to be too awfully clever
to calculate the weight. It's (10) x (9.8) = 98 newtons.
Answer:
40.4 kJ
Explanation:
The gas in this problem is in a sealed tank: this means that its volume is constant, so we can use the pressure law, which states that for an ideal gas kept at constant volume, the pressure is proportional to the temperature of the gas.
Mathematically:
where, in this problem:
is the initial pressure of the gas
is the final pressure
is the initial temperature
is the final temperature
Solving for T2,
Now we can find the change in internal energy of the gas, which is given by:
where:
n = 30 mol is the number of moles
R = 8.314 J/(mol • K) is the gas constant
And substituting the values of the initial and final temperatures, we get: