Answer:
B. 17m/s
Explanation:
This question contains a graph that illustrates the relationship between the speed of a car over time. The graph shows that one can make an inference of the amount of time it takes for the car to cover a particular speed and vice versa.
In this case, after 3 seconds, the speed of the car will be 17 m/s. This inference was got by tracing the position of 3s in the x-axis to the value on the y-axis. Doing this, the best inference for the speed of the car after 3 seconds is 17m/s.
Answer:
(a) The angle of projection is 63 degree.
(b) The velocity of projection is 24.5 m/s.
Explanation:
Height, h = 1 m
horizontal distance, d = 50 m
time, t = 4.5 s
Let the initial velocity is u and the angle is A.
(a) Horizontal distance = horizontal velocity x time
50 = u cos A x 4.5
u cos A = 11.1 .....(1)
Use second equation of motion in vertical direction

Divide (2) by (1)
tan A = 1.97
A = 63 degree
(b) Substitute the value of A in equation (2)
u x sin 63 = 21.8
u = 24.5 m/s
The positive and the negative side
I hope this helps :)
Answer:
416.667 m/s
Explanation:
divide the distance by the time
Answer:
R = 1000 ohm
Explanation:
In a circuit with a resistor R, the current is
V = i R
i₀ = V / R
a resistor R₁ is placed in parallel and the current is tripled i = 3 i₀
V = i Req
i = V / Req
3i₀ = V / Req
we substitute
3 (V / R) = V / Req
3 / R = 1 / Req
R = 3 Req
the equivalent resistance of the two resistors in parallel is

R_{eq} =
R / 3 = \frac{R \ R_1}{R + R_1}
⅓ (R₁ + R) = R₁
R = 3R₁ -R₁ = 2 R₁
R = 2 500
R = 1000 ohm