Distance/ time = 100/5 = 20 km per hour
The average speed at 5hrs is 20 km per hour.
Answer:
Explanation: The moon of the Earth is much lighter in mass than the planet itself. In addition to being smaller than Earth, the Moon is also only approximately 60% as dense. A human weighs less on the Moon because there is less gravitational attraction there than there is on Earth.
Answer:
1250
Explanation:
Let's look at this in a simple manner, because it is.
The crane weights 250Kg. Okay.
Since it is hung, there is the acceleration of gravity being applied on it (10m/s²)
Since F = m * a
F = 250 * 10
F = 2500
Now we know that the downward Force is 2500N.
To find the force that is being applied on that 30° angle, we can multiply our 2500N by cos30°, which happens to be .
Therefore, the force pulling the box in the cable's direction is:
<em />
<em>If you have any questions feel free to comment.</em>
<em />
<em>Have a great one and mark brainliest if it helped, please</em>
Answer:
a) final angular speed w2 = 414rpm
b) time to stop t = 312.5s
c) angular distance from start to stop s = s = 1171.88 rev
Explanation:
Average angular speed wa = (w1+w2)/2 = Angular distance/time = s/t
Given;
w1 = 450 rpm = 450/60 rev/s = 7.5 rev/s
s = 180 rev
t = 25s
a)
s/t = (w1+w2)/2
w2 = 2s/t - w1
Substituting the values;
w2 = 2×180/25 - 7.5 = 6.9 rev/s
w2 = 6.9×60rpm = 414rpm
b)
Angular deceleration a = (w1-w2)/t = (7.5-6.9)/25
a = 0.024 rev/s^2
time t for w2 = 0
t = (w1-w2)/a = (7.5-0)/0.024
t = 312.5 s
c)
Angular distance from start to stop s;
s = w1t - 0.5at^2
s = 7.5×312.5s - 0.5×0.024×312.5^2
s = 1171.88 rev
Answer:
The density of the other liquid = 700 kg/m³
Explanation:
Given that
balance in the air = 29 N
Lets take the mass of the object = m
Volume of the object = V
m g = 29 N -----------1 ( assuming that bouncy force due to air is zero)
Spring balance in the water :
Bouncy force due to water = ρ V g
Density of water = 1000 kg/m³
Spring balance = 19 N
19 + ρ V g = m g
19 + ρ V g = 29
ρ V g =10 ----------2
Spring balance in the another liquid :
Bouncy force due to water = d V g
d=Density of the other liquid
Spring balance = 22 N
22 + d V g = m g
22 + d V g = 29
d V g =7 ----------3
Form equation 2 and 3
d= 700 kg/m³
Therefore the density of the other liquid = 700 kg/m³