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4 years ago

Ruth throws a baseball straight up at 22 m/s. What is the ball's velocity after 1.4 seconds?

Physics

1 answer:

rjkz [21]4 years ago

5 0

Answer: v = 43.98 m/s

Explanation: 22 + 15.7x1.4 = 43.98.

Hope this helps!

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The specific heat of soil is 0.20 kcal/kg*C and the specific heat of water is 1.00 kcal/kg*C. This means that if 1 kg of soil an

stiv31 [10]

Answer: The soil will be $4\°C$ warmer than the water.

Explanation:

The heat (thermal energy) absorbed can be found using the following equation:

$Q=m.C.\Delta T$

Where:

$Q$ is the heat

$m$ is the mass of the element

$C$ is the specific heat capacity of the material.

$\Delta T$ is the variation in temperature

In the case of soil we have:

$Q_{soil}=m_{soil}.C_{soil}.\Delta T_{soil}$ (1)

Where:

$Q_{soil}=1 kcal$

$m_{soil}=1 kg$

$C_{soil}=0.2 kcal/kg \°C$

$\Delta T_{soil}$

In the case of water we have:

$Q_{water}=m_{water}.C_{water}.\Delta T_{water}$ (2)

Where:

$Q_{water}=1 kcal$

$m_{water}=1 kg$

$C_{water}=1 kcal/kg \°C$

$\Delta T_{water}$

Isolating $\Delta T$ from both equations:

$\Delta T_{soil}=\frac{Q_{soil}}{m_{soil}.C_{soil}}$ (3)

$\Delta T_{soil}=\frac{1 kcal}{1 kg(0.2 kcal/kg \°C)}$

$\Delta T_{soil}=5\°C$ (4)

$\Delta T_{water}=\frac{Q_{water}}{m_{water}.C_{water}}$ (5)

$\Delta T_{water}=\frac{1 kcal}{1 kg(1 kcal/kg \°C)}$

$\Delta T_{water}=1\°C$ (6)

Comparing (4) and (6) we can find the soil will be $4\°C$ warmer than the water.

8 0

4 years ago

Which of the following statements is true about a current-carrying wire in a magnetic field? A. Reversing the current direction

Zielflug [23.3K]

B. Reversing the current direction will cause the force deflecting the wire to be perpendicular to the magnetic field but in the opposite direction.

6 0

4 years ago

Cardiovascular fitness measures the health of which body system?

Aloiza [94]

Answer:

I believe it is the circulatory system.

Explanation:

Have a nice day.

5 0

3 years ago

A light-rail train going from one station to the next on a straight section of track accelerates from rest at 1.1 m/s2 for 20 s.

Kruka [31]

It accelerates from rest at 1.1 m/s^2 for 20s.

s = at^2/2 
s = (.5)(1.1)(20)^2= 220m 

then it travels 1100m 

Then it slows down at 2.2m/s^2 until it stops at the station. 

Calculate the train's speed: 
v = at 
v = (1.1)(20) = 22m/s

Now, calculate the time to stop: 
v = at 
t = 22/2.2 = 10s 
s = t(u+v)/2 
s = 10(0+22)/2 = 110m 

(A) Total distance = 220 +1100+110 = 1430m 

(B) Time = 20 + 1100/22 + 10 = 80s

6 0

4 years ago

What is The splitting of white light into its component colours is termed as?

aliina [53]

Answer:

dispersion

As per your query the splitting of white or visible light into its component colours is known as dispersion. The splitting of white light when it passes through a glass prism into its constituent spectrum of colours is hereby known as dispersion.

4 0

3 years ago