When a car is 100 meters from its starting position traveling at 60.0 m/s., it starts braking and comes to a stop 350 meters fro
1 answer:
Remember your kinematic equations for constant acceleration. One of the equations is 
, where 
= final position, 
= initial position, 
= initial velocity, t = time, and a = acceleration.
Your initial position is where you initially were before you braked. That means = 100m. You final position is where you ended up after t seconds passed, so = 350m. The time it took you to go from 100m to 350m was t = 8.3s. You initial velocity at the initial position before you braked was = 60.0 m/s. Knowing these values, plug them into the equation and solve for a, your acceleration:
Your acceleration is approximately
.
Your initial position is where you initially were before you braked. That means
Your acceleration is approximately
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Answer:
1.25377 m/s²
Explanation:
m = Mass of person
g = Acceleration due to gravity = 9.81 m/s²
= Coefficient of friction
= Slope
From Newton's second law
Applying to the above equation and
The acceleration of the same skier when she is moving down a hill is 1.25377 m/s²
Answer:
Approximately at that distance from the center of the planet.
Option A) The low value of near the cloud top of Saturn is possible because of the low density of the planet.
Explanation:
The value of on a planet measures the size of gravity on an object for each unit of its mass. The equation for gravity is:
,
where
.
is the mass of the planet, and
is the mass of the object.
To find an equation for , divide the equation for gravity by the mass of the object:
.
In this case,
, and
.
Calculate based on these values:
.
Saturn is a gas giant. Most of its volume was filled with gas. In comparison, the earth is a rocky planet. Most of its volume was filled with solid and molten rocks. As a result, the average density of the earth would be greater than the average density of Saturn.
Refer to the equation for :
.
The mass of the planet is in the numerator. If two planets are of the same size, would be greater at the surface of the more massive planet.
On the other hand, if the mass of the planet is large while its density is small, its radius also needs to be very large. Since is in the denominator of
, increasing the value of
while keeping
constant would reduce the value of
. That explains why the value of
near the "surface" (cloud tops) of Saturn is about the same as that on the surface of the earth (approximately
.
As a side note, likely refers to the distance from the center of Saturn to its cloud tops. Hence, it would be more appropriate to say that the value of
near the cloud tops of Saturn is approximately
.
Answer:
Minimum capacitance = 200 μF
Explanation:
From image B attached, we can calculate the current flowing through the capacitors.
Thus;
Since V=IR; I = V/R = 5/500 = 0.01 A
Maximum charge in voltage is from 5V to 4.9V. Thus, each capacitor will have 2.5V. Hence, change in voltage(Δv) for each capacitor will be ; Δv = 0.05 V
So minimum capacitance will be determined from;
i(t) = C(dv/dt)
So, C = i(t)(Δt/Δv) = 0.01[0.001/0.05]
C = 0.01 x 0.0002 = 200 x 10^(-6) F = 200 μF
