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3 years ago

An 8.38 gram sample of water lost 870 J of heat. What is the change in temperature

Physics

1 answer:

Virty [35]3 years ago

6 0

Answer:

Find the mass of a sample of water if its temperature dropped 24.8 degrees Celsius when it lost 870 J of. heat. (specific heat of water is 4.18 J/g x degrees Celsius) 8.38 grams. How many degrees would the temperature of a 450 g piece of iron increase if 7600 J of.

Explanation:

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Consider a circuit with two resistors in parallel R_1 = 10 ohm and R_2 = 5 ohm.A) Determine the total resistance of the circuit.

Sophie [7]

Answer:

Explanation:

Given

$R_1=10 \Omega$

$R_2=5 \Omega$

when resistance in Parallel

$\frac{1}{R_{p}}=\frac{1}{R_1}+\frac{1}{R_2}$

$R_p=\frac{R_1R_2}{R_1+R_2}$

$R_p=\frac{10}{3}$

Suppose V is voltage of battery

Total Current $i=\frac{3V}{10}$

Since Circuit is Parallel therefore Voltage across both resistor is same

$V=i_1R_1=i_2R_2$

and $i_1+i_2=i$

$i_1+i_1\cdot \frac{R_1}{R_2}=i$

$i_1(1+\frac{10}{5})=\frac{3V}{10}$

$i_1=\frac{V}{10}$

$i_2=\frac{2V}{10}$

(b) When Circuit is in series

$R_s=R_1+R_2$

$R_s=10+5=15 \Omega$

since circuit is in Series therefore current is same in both resistor

Current $i=\frac{V}{15} A$

Voltage drop across $R_1=i\times R_1$

$V_1=\frac{V}{15}\times 10=\frac{2V}{3}$

$V_2=\frac{V}{15}\times 5=\frac{V}{3}$

8 0

3 years ago

Suppose that instead of dropping the rock you throw it downwards so that its speed after falling 7 meters is 23.43 m/s. How much

Shkiper50 [21]

Answer:

3,298.1 Hz

Explanation:

Solution is attached

5 0

3 years ago

Read 2 more answers

A fish is hooked on a line that is wound around the spool of a fishing reel. The reel has a mass of 652 g and a diameter of 10 c

iren2701 [21]

The magnitude of the force exerted by the fish is 3,052.5 N.

The given parameters;

mass of the reel, m = 652 g = 0.652 kg

diameter of the reel, d = 10 cm

radius of the reel, r= 5 cm = 0.05 m

time of motion, t = 5 s

angular speed of the reel, ω = 306 rad/s

According to Newton's third law, the force exerted by the reel is equal in magnitude to the force fish exerted on the reel.

The centripetal force of the reel = force exerted by the fish

$F_c = m\omega^2 r\\\\F_c = 0.652 \times (306)^2 \times 0.05\\\\F_c = 3,052.5 \ N$

Thus, the magnitude of the force exerted by the fish is 3,052.5 N.

Learn more here: brainly.com/question/14905888

3 0

3 years ago

As a science fair project, you want to launch an 950 g model rocket straight up and hit a horizontally moving target as it passe

Aleksandr-060686 [28]

Answer:

As a science fair project, you want to launch an 950g model rocket straight up and hit a horizontally moving target as it passes 33.0m above the launch point. The rocket engine provides a constant thrust of 20.0N . The target is approaching at a speed of 18.0m/s . At what horizontal distance between the target and the rocket should you launch?

= 43.56m

Explanation:

acceleration =

(20 - (0.95 * 9.8) )/ (0.95)

= 10.68 / 0.95

= 11.24 m/s²

we use

s = ut + (1/2) at²

Given that

s= 40

u =0

s = 0 * t + (1/2) (11.24)t²

t = √(66/1.24)

t = √5.87

t = 2.42sec

hence

Horizontal distance = 18 * 2.42

= 43.56m

5 0

3 years ago

We know that the frequency and wavelength of an oscillation are related by the velocity of the wave . In standing waves, the wav

Sidana [21]

Answer

the medium does not change the speed of the on they should change.

Explanation:

The speed of the waves is constant for a given medium, depending on the physical properties of the medium,

When a wave is strapped on a wall of a medium it does not change the properties of the medium, the wave changes direction, but since the medium does not change the speed of the on they should change.

3 0

3 years ago