The distance from Buzău to Iaşi is 72 km. Find out the time a vehicle travels this distance if it has a speed of 72 km per hour. Expresses the speed in the unit of measurement in SI. I give the crown! Thank you
Answer:
3600seconds
Explanation:
Given parameters:
Distance = 72km
Speed = 72km/hr
Unknown:
Time it takes for the vehicle to travel the distance = ?
Solution:
Speed is the distance divided by time;
Speed = 
time =
Insert the parameters;
time = 
= 1hr
The SI unit of time is in seconds;
3600 seconds is 1hr
The time is 3600seconds
Answer:
amount of work done, W = 549.36 kJ
Given:
mass of a car engine, m = 2500 kg
initial velocity, u = 45 mph
final velocity, v = 65 mph
1 mile = 1609
Solution:
We know that 1 hour = 3600 s
Now, velocities in m/s are given as:
u = 45 mph = 
= 20.11 m/s
v = 65 mph = 
= 29.05 m/s
Now, the amount of work done, W is given by the change in kinetic energy of the car and is given by:
W = 
W = 
W = 
W = 549.36 kJ
Answer:
F = m a, a = 0.3 m / s²
this acceleration points in the direction of the unbalanced force
Explanation:
In this problem we must use Newton's second law. Let's fix a reference system with the x axis parallel to the surface and the y axis perpendicular
Y axis y
N-W = 0
N = W = mg
X axis
∑ F = m a
F = m a
we substitute
150 = m a
To find an acceleration value, the mass of the car must be known, if the mass is m = 500 kg
a = 150/500
a = 0.3 m / s²
this acceleration points in the direction of the unbalanced force
Answer:
The maximum acceleration that the truck can have before the refrigerator begins to tip over is 3.79 m/s^2
Explanation:
Mass of refrigerator, m = 120 kg
Refrigerator height, h = 2.2 m
Width of refrigerator, w = 85 cm = 0.85 m
acceleration due to gravity, g = 9.81 m/s^2
From the principles of moments, the refrigerator will start to tip at the point when the forces are balanced at the edge of the width.
Therefore, taking moments about the edge, where the weight acts at the geometric center, we have
m×g×w/2 = m×a×h/2
120×9.81×0.85/2 = 120×a×2.2/2
or a = 3.79 m/s^2
