Answer:
<h2>After 3.06seconds</h2>
Explanation:
Given that the following data are
acceleration a= 3,2m/s^2
distance s=15m,
time t=?
Applying the formula for the equation of motion we have
s=ut+1/2at^2
we no initial velocity (u=0)
substituting our given values into the expression we have
15=0*t+1/2(3.2)t^2
15=1/2(3.2)t^2
15=3.2t^2/2
30=3.2t^2
t^2=30/3.2
t^2=9.375
Squaring both sides we have
t=√9.375
t=3.06seconds
<em>It will take the sled 3.06 seconds to get to the bottom</em>
Answer: He must drive at 58.8mi/hr
{3 significant figure}
Explanation: The original speed of the car to complete the journey normally is = 550mile/10hr
= 55mi/hr
The normal time to cover 120 mile with that speed is
t = distance/speed
= 120/55
=2hr, 0.18*60=11mins
= 2hr11mins.
But the driver found out he was 30mins behind at this distance, so he spent
2hr 11min +30min= 2hr41mins
For him to meet up the original schedule time 10hrs, he has
(10-2.41)hrs = 7hr19mins to cover the remaining distance of
{550-120}=430mile.
First, 7hr19mins= {7*(19/60)}hr
= {439/60}hr
Now let's find the speed at which the driver must move for him to cover for his initial delay
Speed= distance/time
= 430/{439/60}
This is same as writing
Speed = 430/439/60
Using the law of reciprocal,
Speed = (430*60)/439
= 25800/439
= 58.7699mi/hr
But we were asked to leave our answer in 3 significant figure. Therefore,
Speed = 58.8mi/hr
Answer:
B
Explanation:
that is the most common due to the fact that you can observe what you want before you make a purchase
Explanation:
Given data
The elevator mass=3.0×10³ kg
Time t=23 s
elevator lift d=210 m
The power is the average rate of work done:
So
P=F.V Cosα
Where F is force
V is velocity
α is angle between Force and velocity
Apply the Newton Law to find the force on elevator
The velocity of elevator is given as
Since the net force has same direction of motion so α=0°
So
Answer:
Explanation:
The Anti-Federalists had a strong distrust of government power. A national government with too much power was, as far as they were concerned, a pathway to government oppression. In 1787, for example, “Brutus,” who was probably New York judge Robert Yates, wrote to the citizens of New York, “when the people once part with power, they can seldom or never resume it again but by force.”1