Which statement best describes longitudinal waves?

Car A m= 2000kg v=20 km/h Car B m= 2000kg v= 20km/h what is the location after impact

Darya [45]

Mass of car, M=2000kg

Velocity, V=72× 5/18 =20ms¹

Apply kinematic equation of motion

v² -u² = as

0 − 20² =2a×20

a=−10ms^-2

Breaking force, F=ma=2000×10=20 kN

Apply first kinematic equation

v = u +at

$t= \frac{v - u}{a} = \frac{0 - 20}{ - 10} = 2sec\\$

7 0

3 years ago

In an orbiting space shuttle, you are handed two identical boxes, one filled with sand and the other filled with feathers. How c

Aleks04 [339]

Explanation:

Simply, shake the boxes. The box that is difficult to shake will be the sand and the box that will be easier will be the feathers.

3 0

4 years ago

A 30-kg object on Venus weighs 266.1 N. What is the value of gravity on Venus? A. 8.87 m/s2

Marat540 [252]

The weight force on an object in a gravitational field is given by $F = mg$ where $m$ is the mass in kg and $g$ is the acceleration due to gravity at that place. Rearranging:
 $g = \frac{F}{m} = \frac{266.1}{30} = 8.87 Nkg^&-1$ or $8.87ms^&-2$
Explanation:

Venus is only slightly smaller than Earth, in both mass and radius, so this answer makes sense, when compared with the value of $9.81 Nkg^&-1$ at Earth's surface.

4 0

3 years ago

Two light bulbs each having a resistance of 3ohms are connected in series to a battery marked 12 volts. how much current will fl

Ludmilka [50]

Givens

Total Resistance (the bulbs are connected in series)

R = r1 + r2
r1 = 3 ohms
r2 = 3 ohms
R = 3 + 3 = 6 ohms
E = 12 volts
I = ??

Formula

E = I * R

Solution

12 = I * 6 Divide both sides by 6

12/6 = I*6/6

2 = I

The current = 2 amperes. Answer

6 0

4 years ago

A girl coasts down a hill on a sled, reaching level ground at the bottom with a speed of 7.4 m/s. The coefficient of kinetic fri

Amanda [17]

Answer: 62.22 meters

Explanation:

Two solve this, we need to know first how the Sled interact with the snow. While the Sled runs over the snow, the snow opposes to it movement, this is call friction. Frictions creates is a force that goes against any movement and is caused by the interaction between surfaces.

Friction can be calculated using the following equation:

Friction's Force (Ff) = m*N

Where m is the Frictions coficient and N is call Normal, which is a force created by the contact between any weight and a surface. Because the sled is and the surface are totally horizontal, the Normal is equal to the Sled's Weight.

So for this case, we can calculate the Friction's Force:

Ff = 0.045 * 735 N

Ff = 33,07 N

This force will cause a negative acceleration the Sled causing it to slow down and finally stop. To know this accelaration we can use the following equation:

Force (F) = Mass (m) * Accelaration (a)

Looking for the accelaration:

Acceleration (a) = F / M

As a side note:

Mass (M) = F / a (1)

Where we know that F is equal to our Friction Force (Ff) and the Mass for the girl and the Sled can be obtained using the previous equation (1) like this

Girl and sled Mass (M) = 735 N / (9.81 m/s)

M = 74,92 Kg

This is posible, because the Girl and The Sled are aplying a Force on the ground equal to 735 N. The accelartion for their mass is the gravity

Now, with the mass we can found the Accelaration caused by friction:

Acceleration (a) = Ff / M

Accelaration (a) = 33,07 N / 74,92 Kg

a = 0,44 $m/s^{2}$

To know how far the Sled travel we can use the following equation:

$V_{f} ^{2} = V_{0} ^{2} + 2ax$

Where Vf is the Final Velocity, which is when the sled finally stops (Vf = 0), Vo is the Initial Speed of the Sled equal to 7.4 m/s and a is equal to the negative accelaration that causes the friction.

$(0)^{2} = (7.4 m/s)^{2} + 2(-0,44)x$

Searching for x:

$x = \frac{0 - (7.4 m/s)^{2} }{-0.88}$

$x = 62.22 meters$

The girls will run over the snow 62.22 meter until finally stopping

4 0

3 years ago