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4 years ago

8

What is the temperature shown on the thermometer below?

1 answer:

erik [133]4 years ago

7 0

Answer:

D, -8 F

Explanation:

This specific thermometer is in increments of two degrees per minor line and 10 per thicker line. Since the thermometer is showing below zero, the answer cannot be A or B since they are positive. -4 Cannot be the answer since the line addition does not make sense for that. It would be -4 if the thick line increments were 5 degrees instead of ten. Therefore if you count the lines by two from zero down to the thermometer line, you would get -8 Degrees F

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From a branch 35 m high, a 0.75 kg bird dives into a small fish tank containing

Bad White [126]

Answer:

ΔT = 1.22*10^-3 °C

Explanation:

First, you calculate the potential energy of the bird when it is at 35 m high. The potential energy is also the mechanical energy of the bird in this case.

$U=mgh$

m: mass of the bird = 0.75kg

g: gravitational constant = 9.8m/s^2

h: height = 35m

$U=(0.75kg)(9.8m/s^2)(35m)=257.25\ J$

All this energy is given to the water. You use the following formula in order to calculate the change in temperature:

$Q=mc\Delta T$

m: mass of the water = 50kg

c: specific heat of water = 4186 J/kg°C

Q is equal to U (potential energy of the bird) because the bird gives all its energy to water. By doing ΔT the subject of the formula you obtain:

$\Delta T=\frac{Q}{mc}=\frac{257.25J}{(50kg)(4186J/kg°C)}=1.22*10^{-3}\ \°C$

hence, the maximum rise in temperature is 0.00122 °C

7 0

3 years ago

a bowling ball and a bag of potato chips are dropped at the same time from a tall on Earth , which hits the ground first ?

malfutka [58]

Isn’t it a bowling ball cause it’s the heaviest so it likely to go faster and hit the ground .

5 0

3 years ago

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The pitchers mound in baseball is 85 meters from home plate . If it takes 4.1 seconds for a pitch to reach the plate , how fast

adoni [48]

Answer: 20.73m/s

Explanation:

The question simply wants us to calculate the speed of the pitch. The speed will be calculated as:

= Distance/Time

where,

Distance = 85 meters

Time = 4.1 seconds

Speed = Distance/Time

Speed = 85/4.1

Speed = 20.73m/s

Therefore, the speed of the pitch is 20.73m/s.

3 0

4 years ago

When a battery, a resistor, a switch, and an inductor form a circuit and the switch is closed, the inductor acts to oppose the c

GaryK [48]

Answer:

The time constant becomes twice.

Explanation:

$T$ = Time constant of the L-R circuit

$L$ = Inductance of the inductor

$R$ = Resistance of the resistor

Time constant of the L-R circuit is given as

$T = \frac{L}{R}\\$

$T_{1}$ = initial time constant of the L-R circuit = $T$

$T_{2}$ = final time constant of the L-R circuit

$L_{1}$ = Initial inductance of the inductor = $L$

$L_{2}$ = Initial inductance of the inductor = $2L$

For the same resistance, the time constant depend directly on the inductance, hence

$\frac{T_{1}}{T_{2}} = \frac{L_{1}}{L_{2}}\\\frac{T}{T_{2}} = \frac{L}{2L}\\\frac{T}{T_{2}} = \frac{1}{2}\\T_{2} = 2T$

7 0

4 years ago

A book that weighs 20 N sits on a table. How big and in what direction does the force of gravity from the Earth act on the book?

taurus [48]

Answer:

A. 20 N down

Explanation:

It's asking how much force of gravity is acting on it. The book weighs 20 Newtons so that's how much gravity is being applied. Hope this helps

7 0

3 years ago

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