Answer: 350 newton
Explanation:
Force needed = ?
mass = 10kg
Acceleration = 35m/s2 (The SI unit of acceleration is metre per second square)
Recall that Force is the product of mass of an object and the acceleration by which it moves.
Force = mass x acceleration
Force = 10kg x 35m/s2
Force = 350N
Thus, the force needed is 350 newton
Answer:
0.273 MHz
Explanation:
The frequency f₁ of the reflected waves to the stationary detector is given by
f₁ = f(v + v₁)/(v - v₂) where f = frequency of sound waves = 0.225 MHz, v = speed of sound in air = 343 m/s, v₁ = speed of detector = speed of truck = 33.0 m/s and v₂= speed of source of reflected wave = speed of truck = 33.0 m/s
f₁ = f(v + v₁)/(v - v₂)
= 0.225MHz(343 m/s + 33 m/s)/(343 m/s - 33 m/s)
= 0.225MHz × 376/310
= 0.273 MHz
Question 4
B. Toby is correct because the rock is experiencing a negative acceleration, causing its positive velocity to decrease until the rock reaches a velocity of O m/s before becoming negative.
Question 5
At the maximum height, velocity is 0, so:
v = v₀ - gt
0 = 14.75 - 9.8t
t = 14.75/9.8
t = 1.5 s (OPTION A)
Answer:
1.27
Explanation:
Period of a pendulum T is
T = 2¶(l/g)^0.5
Where g is acceleration due to gravity
l is lenght of pendulum
For earth, T = 2.243 s
2.243 = 2 x 3.142 x (l/9.81)^0.5
0.36 = (l^0.5)/3.13
1.13 = l^0.5
l = 1.28 m
For planet X of the same lenght
Period T = 2.00 s
2 = 2 x 3.142 (1.28/gx)^0.5
0.32 = 1.13 / gx^0.5
3.53 = gx^0.5
gx^0.5 = 3.53
gx = 12.46 m/s^2
gx/gearth = 12.46/9.81 = 1.27
Answer:
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Explanation: