Answer:
A ) 1000 m.
Explanation:
Here initial velocity u = 100 m /s
Final velocity v = 0
Acceleration a = -5 ms⁻²
Distance travelled = S
v² = u² + 2aS
0 = (100)² -2 x 5 S
S = 10000/ 10
=1000 m.
Answer:
The probability of an incorrect report is found to be 0.03 or 3%.
Explanation:
We will get an incorrect report in both the cases of false alarm or missing excessive radiation. Since, both are mutually exclusive events. Therefore, the probability of both events to occur simultaneously will be 0. Thus, the probability of an incorrect report will be the sum of the probability of false alarm and the probability of a missing radiation.
P (False Alarm) = 0.02
P (Missing Radiation) = 0.01
P(Incorrect Report) = P (False Alarm) + P(Missing Radiation)
P (Incorrect Report) = 0.02 +0.01
P(Incorrect Report) = 0.03 = 3%
Answer:
The maximum altitude reached with respect to the ground = 0.5 + 0.510 = 1.01 km
Explanation:
Using the equations of motion,
When the rocket is fired from the ground,
u = initial velocity = 0 m/s (since it was initially at rest)
a = 10 m/s²
The engine cuts off at y = 0.5 km = 500 m
The velocity at that point = v
v² = u² + 2ay
v² = 0² + 2(10)(500) = 10000
v = 100 m/s
The velocity at this point is the initial velocity for the next phase of the motion
u = 100 m/s
v = final velocity = 0 m/s (at maximum height, velocity = 0)
y = vertical distance travelled after the engine shuts off beyond 0.5 km = ?
g = acceleration due to gravity = - 9.8 m/s²
v² = u² + 2gy
0 = 100² + 2(-9.8)(y)
- 19.6 y = - 10000
y = 510.2 m = 0.510 km
So, the maximum altitude reached with respect to the ground = 0.5 + 0.510 = 1.01 km
Hope this helps!!!
It is B. secod try i know its dumb but im trying to cheer myself up
Answer:
D. injuries associated with lifting loads
Explanation:
The retail industry or store is the industry that involves the handling of their goods directly from the manufacturer and delivers goods to the consumer.
<em>The health risk is acculipble to workers in the retail sector is injuries associated with lifting loads because while manually handling heavy or awkward sized objects, which are common in the retail industry causes strains and sprains. </em>
So, the common activity in the retail store is lifting loads which leads to common injuries such as strains and sprains.
Hence, the correct answer is "D. injuries associated with lifting loads".
