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Kinematics
Kinematics is the study of how a body moves. This includes linear motion, angular motion, and rotational motion.
3,459 Questions
How do you change 26 centimeters per second to kilometers per hour?
26 cm/s (1 meter/100 cm)(1 kl/1000 meters)(3600 seconds/1 hour)
= 0.94 kilometers per hour
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If The fastest person runs 2964 feet in 22.4 seconds how many miles per hour is that show the work?
5280 ft = 1 mile
1 hr = 3600 seconds
speed = distance ÷ time
= 2964 ft ÷ 22.4 s
≈ 132.32 ft/s
= 132.32 × 3600 ft/h
≈ 476,357 ft/hr
= 476,357 ÷ 5280 mph
≈ 90 mph
They are a very fast runner.
The world record for 800m (approx 2624 ft) is 100.91s which is an average speed of approx 17.7 mph.
The world record for 100m (approx 328 ft) is 9.58s which is an average speed of approx 23.4 mph.
As distances increase, the average speed will drop as humans cannot sustain the fast pace.
At a constant rate:
distance = time x speed
Since you are calculating the distance based on the other two numbers, I would say that distance is the dependent variable (it is based on the values of the other variables).
400 km i took 5.8333333 what was the speed per hour I am?
The answer will depend on whether you took 5.8333333 seconds, hours, days, years. And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
If a worker used 6000 joules of work to pull his sled 70 seconds what power does he need?
6000 joules / 70 seconds = 85.71 watts
If two forces are in the same direction, they aid one another, making it easier to push or pull.
The slope of a line on a velocity-time graph is acceleration.
This kind of question is tricky, because average velocity is not simply the average OF the velocities. The reason is you spend more time driving the slower part.
The correct approach is to compute (average velocity) = (total distance) / (total time)
Total distance = 232 + 232 km.
Total time = (time going 46 km/h) + (time going 70 km/h)
The above terms are found by computing distance/speed:
at 46 km/h, it takes (232 km) / (46 km/h) = (232/46) hours
etc. - you can finish the details.
How do helmets reduce friction?
Basically to reduce air friction on a body, the most general idea is to streamline the body. The same is done by the helmet. When one drives a bike , the person takes a position which streamlines the flow of air over the body(i.e, he bends, like in motoGPs). But the head is not so streamlined and it can obstruct the air flow and hence can add additional drag. The helmet is also designed in the same way(take a look at the design of helmet of cyclists), it is streamlined, so that now the air flows smoothly over the head portion, hence reducing the drag.
Why and how did world trade centre building 7 come down in its own footprint?
It did rather exceed it's footprint, but the reasons it didn't "fall over" are as follows;
1. The structural failure was towards the top, so the bottom was fine and thus all stayed upright until the vertical shock loads of the falling floors above caused failure, which was progressive and local.
2. The walls were 'tied in' by the floors, so did not individually 'fall out', except for the small components after failure. There would certainly also have been a central 'core', with stairs, lift shafts etc, which would have failed last, so each floor would be likely to have 'slid' down around the core on impact of the floors above, before the core itself failed.
2.
How fast does something slow down when hitting the ground?
If you're talking about velocity, it would change drastically upon hitting the ground. Because it is a vector quantity, the number would be it's negative since the object moves backwards..
However, if you're talking about speed, the number would not change much upon hitting the ground. If drawn on graph, it would look like a wave that steeps down everytime it hits the maximum point and have the same minimum point; zero, a wave which gradually gets smaller over time.
A slope of a position vs time graph is equal to?
The slope of a position vs time graph represents the velocity of the object. It indicates how the position changes over time, with a steeper slope corresponding to a higher velocity and a flatter slope corresponding to a lower velocity.
What is the formula for impulse?
Impulse is a change in momentum. Refer to the related link below for more information and equations about change in momentum, or impulse.
What does slope of position time graph represents?
The slope of a position-time graph represents the velocity of an object. A steeper slope indicates a higher velocity, while a flatter slope indicates a lower velocity. Positive slopes represent motion in one direction, negative slopes represent motion in the opposite direction, and a horizontal line represents an object at rest.
What is the effect of balance forces on an object that is not moving?
A group of balanced forces adds vectorially to zero, so has
no effect on any object, whether it's moving or not moving.
velocity is the rate of change of displacement with respect to time where as acceleration is the rate of change of velocity with respect o tome.
There is no correlation. One measures power, the other speed.
What is the definition of unbalanced foces?
-- A group of two or more forces is unbalanced when the vector sum
of its individual component forces is not zero.
-- A group of two or more forces is balanced when the vector sum
of its individual component forces is zero.
Notice that it's not the forces that are balanced or unbalanced.
It's the whole group of them that's balanced or unbalanced.
When an object is moving it stays moving unless acted upon by?
When an object is moving it stays moving unless acted upon by opposing force(s). i.e. gravity, friction, etc. See Newton's 1st law of motion: related links.
You may have to determine the coeffient by experiment. It is impossible to include every possible combination of materials.
This can build a "sled" and place one material flat along the bottom. A thirty pound sled is common. Pull this weight across a flat surface covered by the other material. Measure the amount of force required to initiate movement using a spring scale (like a fish scale). This force in pounds divided by the weight of the sled in pounds will equal the coefficient of static friction. To determine the dynamic coefficient of friction, measure the pounds required to keep the sled in motion. This will be somewhat less than the force required to start the sled in motion.
The coefficient for vinyl and nylon should be quite low.
