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3 years ago

A ball rolling on grass has more friction than a ball rolling on tile

Physics

2 answers:

Dmitry_Shevchenko [17]3 years ago

6 0

Answer:

When you slide an object there is less friction than when you roll it. an object's acceleration (change in speed) depends on the mass of the object and the amount of force applied on it. an object at rest stays at rest unless a force acts on it. ... A ball rolling on grass has more friction than a ball rolling on tile.

denpristay [2]3 years ago

6 0

Answer:

Explanation:

When you slide an object there is less friction than when you roll it. an object's acceleration (change in speed) depends on the mass of the object and the amount of force applied on it. an object at rest stays at rest unless a force acts on it.

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2. A student drives 7.8-km trip to school and averages a speed of

Alekssandra [29.7K]

Answer:

The total time is: t=451.22 sec

The average speed is: V=34.57 m/s

Explanation:

Average speed

The average speed is calculated by dividing the total distance traveled by an object (x) by the total time it took it to travel that distance (t).

$\displaystyle V=\frac{x}{t}$

Since the student makes the trip in two parts, we have to calculate the total distance and the total time.

We know the distance to school is 7.8 Km = 7,800 m. The student makes his way home over the same distance, thus the total distance is

x=2*7,800 m=15,600 m

The first trip to school was done at an average speed of v1=32.6 m/s. Knowing the distance and speed, we can calculate the time:

$\displaystyle t1=\frac{x1}{v1}=\frac{7,800}{32.6}=239.26\ sec$

The second trip back home was done at an average speed of v2=36.8 m/s. Let's calculate the second time:

$\displaystyle t2=\frac{x2}{v2}=\frac{7,800}{36.8}=211.96\ sec$

The total time is:

$t=239.26\ sec+211.96\ sec=451.22\ sec$

$\boxed{t=451.22\ sec}$

The average speed is:

$\displaystyle V=\frac{15,600}{451.22}=34.57\ m/s$

$\boxed{\displaystyle V=34.57\ m/s}$

6 0

3 years ago

What is the work done in lifting 60 kg of blocks to a height of 20m

erastovalidia [21]

Answer:

The answer is 1200

Explanation:

5 0

2 years ago

In a laboratory experiment, a diffraction grating produces an interference pattern on a screen. If the number of slits in (inclu

Darya [45]

Answer:

Explanation:

When the number of slits increases, the intensity of fringes increases.

So, the fringes appear to be more bright.

As we know that the fringe width is inversely proportional to the number of slits, so as the number of slits increases, the fringe width decreases, hence the fringes are narrower, bright and close together.

7 0

3 years ago

NEED HELP ASAP!!!!!!!!!!!!!

love history [14]

Answer: Decreased risk of heart attack

Explanation:

thats the answer because it actually

increase rish of heart attack

Hope this helps :)

5 0

4 years ago

Read 2 more answers

A car jumps off a ramp with a Kinetic energy of 5,000 joules. This same car has a gravitational potential energy of 4,685 joules

Sedaia [141]

Answer:

14,653 J.

Explanation:

We know that,

Total mechanical energy is equal to the sum of all the potential and kinetic energies.

Given,

Kinetic energy when a car jumps off a ramp= 5000 J

Potential energy = 4685 J

Potential energy when the car lands= 4968 J

TME = 5000 + 4685 + 4968

= 14,653 J

Hence, the car's total mechanical engery is equal to 14,653 J.

3 0

3 years ago