Suppose the stone is thrown at an angle of 39.0° below the horizontal from the same building as in the Example above. If it strikes the ground 47.8 m away, find the following. (Hint: For part (a), use the equation for the x-displacement to eliminate v0t from the equation for the y-displacement.)(a) the time of flight sThe x coordinate as a function of time is x(t) = vcos(39.0)t, so the initial speed is v0 = Δx/(cos 39.0Δt), where Δx = 47.8 and Δt is the time of flight. Insert this into your equation for y(t) and solve for the time of flight. Note that the answer should be smaller than 3.16227766016838, since the stone is thrown down (and to the right).(b) the initial speed m/s(c) the speed and angle of the velocity vector with respect to the horizontal at impactspeed m/sangle °
Answer:
C= 0.354 KJ/K
Explanation:
As we know that heat capacity is the product of mass and specific heat.Heat capacity is the measure of heat which any substance can retain a period os time.
Here given that specific heat(c) = 1.77 KJ/kg.k
Mass m= 200 gm = 0.2 kg
So the heat capacity C = m.c
C= 0.2 x 1.77 KJ/kg
C= 0.354 KJ/K
So the heat capacity 0.354 KJ/K.
The definition of velocity is a speed in a given direction. So the unit must include the speed and the direction that the object is moving. C. 31 m/s north is the correct answer, because the unit has the speed and the distance included. Although D has the same factors in it's answer, speed is only distance divided by time, and is not squared as it is shown incorrectly in answer D.
The ratio between initial and final speed is 3:4
Explanation:
The speed of a wave is given by the wave equation:
where
v is the speed
f is the frequency of the wave
is the wavelength
In this problem, we have a wave with wavelength and initial frequency
So its speed can be written as
Later, its frequency changes to
Assuming that its wavelength has not changed, this means that its new speed is
By calculating the ratio between the two,
So, the ratio between initial and final speed is 3:4.
Learn more about waves:
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