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2 years ago

Every summer I drive to Pennsylvania. It is 895 km to get there. If I average 100 km/hr, how much time will I spend driving?

Physics

1 answer:

Ivan2 years ago

6 0

Answer the time you bee spending driving iss 795 because 895-795=100

Explanation:

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A car is traveling at 70 km/h. It then uniformly decelerates to a complete stop in 12 s. Find its acceleration ( in m/s2 ).

Yakvenalex [24]

Answer:

Acceleration will be $-1.620m/sec^2$

Explanation:

We have given initial speed of the car is 70 km/hr

We know that 1 km = 1000 m

And 1 hour = 3600 sec

So $70km/hr=70\times \frac{1000m}{3600sec}=19.444m/sec$

It is given that car stops in 12 sec

So final speed of the car v = 0 m/sec

Time t = 12 sec

From first equation of motion v = u+at

So $0=19.444+a\times 12$

$a=\frac{-19.444}{12}=-1.620m/sec^2$ ( negative sign indicates that speed of the car will constantly decrease )

5 0

3 years ago

Read 2 more answers

What’s the answer for this problem?

pickupchik [31]

The answer is always true a

4 0

3 years ago

When friction slows a sliding block___

Svetradugi [14.3K]

Answer:

Explanation:

When friction slows a sliding block, the kinetic energy of the block is transformed into internal energy .

The frictional movement of two surfaces over one another leads to the conversion of some of their kinetic energies to another energy - heat or thermal energy. Hence, the temperatures of the objects are raised in the process.

Therefore, when a sliding block is slowed down due to friction, some of the kinetic energy of the block would be transformed into internal energy in the form of heat.

The correct option is A.

6 0

3 years ago

How much potential energy does a 40-N medicine ball gain when it is lifted 5 m?

777dan777 [17]

We know, Potential Energy = Force * Height
Here, F = 40 N
h = 5 m

Substitute their values,
U = 40 * 5
U = 200 J

In short, Your Answer would be Option A

Hope this helps!

6 0

3 years ago

A gymnast weighs 450 N. She stands on a balance beam of uniform construction which weighs 250 N. The balance beam is 3.0 m long

Damm [24]

Answer:

x = 9.32 cm

Explanation:

For this exercise we have an applied torque and the bar is in equilibrium, which is why we use the endowment equilibrium equation

Suppose the counterclockwise turn is positive, let's set our reference frame at the left end of the bar

- W l / 2 - W_{child} x + N₂ l = 0

x = $\frac{-W l/2 + n_2 l}{W_{child}}$ 1)

now let's use the expression for translational equilibrium

N₁ - W - W_(child) + N₂ = 0

indicate that N₂ = 4 N₁

we substitute

N₁ - W - W_child + 4 N₁ = 0

5 N₁ -W - W_{child} = 0

N₁ = ( W + W_{child}) / 5

we calculate

N₁ = (450 + 250) / 5

N₁ = 140 N

we calculate with equation 1

x = -250 1.50 + 4 140 3) / 140

x = 9.32 cm

7 0

3 years ago