Answer:

Explanation:
Kinetic energy is the energy an object possesses due to motion. The formula 1/2 the product of mass and the squared velocity.

We know the baseball's kinetic energy is 105 Joules. It is also traveling at a velocity of 10 meters per second. `
First, convert the units of Joules to make unit cancellation easier later in the problem. 1 Joule (J) is equal to 1 kilogram square meter per square second (kg*m²/s²). The baseball's kinetic energy of 105 J is equal to 105 kg*m²/s².
Now we know 2 values:
Substitute these values into the formula.

Now we need to solve for m, the mass. Solve the exponent.
- (10 m/s)²= 10 m/s * 10 m/s = 100 m²/s²

Multiply on the right side.


The variable, m, is being multiplied by 50 square meters per square second. The opposite of multiplication is division, so we divide both sides by that value.


The units of square meter per square second will cancel out.


The mass of the baseball is <u>2.1 kilograms. </u>
Answer:

The ratio m_2/m_1 of the masses is 9.745
Explanation:
Formula for frequency when mass m_1 is hung on the spring:

where:
k is the spring constant
Formula for frequency when mass m_2 is hung on the spring along with m_1:

where:
k is the spring constant.
In order to find ratio m_2/m_1, Divide the above equations:

On Solving the above equation:

The ratio m_2/m_1 of the masses is 9.745
Answer:
900kJ
Explanation:
Work done hereis lifting that water mass on to the surface level
v = volume of the tank
d= density of water (1000kg/m3)
g = gravotational acceleration
workdone=Weight * distance
= (v*d*g)*distance
=