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1 year ago

HEY GUYS IS THIS TRUE OR FALSE????????

Physics

2 answers:

slavikrds [6]1 year ago

8 0

Answer:
false

explanation:

Nastasia [14]1 year ago

3 0

Answer:

False

Hope This Helps!

Explanation:

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Megan left her bicycle outside on the patio while she went on vacation for several weeks. When she returned, Megan discovered a

Effectus [21]

Rust is a chemical change. Chemical changes are when the substances that make up an object change into other chemicals. For example, rust. What happens is metal and oxygen/water react and create rust. Hope this helps :)

8 0

1 year ago

Read 2 more answers

A 125-g metal block at a temperature of 93.2 °C was immersed in 100. g of water at 18.3 °C. Given the specific heat of the metal

Nataly_w [17]

Answer:

34.17°C

Explanation:

Given:

mass of metal block = 125 g

initial temperature $T_i$ = 93.2°C

We know

$Q = m c \Delta T$ ..................(1)

Q= Quantity of heat

m = mass of the substance

c = specific heat capacity

c = 4.19 for H₂O in $J/g^{\circ}C$

$\Delta T$ = change in temperature

Now

The heat lost by metal = The heat gained by the metal

Heat lost by metal = $125\times 0.9\times (93.2-T_f)$

Heat gained by the water = $100\times 4.184\times(T_f -18.3)$

thus, we have

$125\times 0.9\times (93.2-T_f)$ = $100\times 4.184\times(T_f -18.3)$

$10485-112.5T_f = 418.4T_f - 7656.72$

⇒ $T_f = 34.17^oC$

Therefore, the final temperature will be = 34.17°C

6 0

2 years ago

The sound level at 1.0 m from a certain talking person talking is 60 dB. You are surrounded by five such people, all 1.0 m from

Hunter-Best [27]

Answer:

66.98 db

Explanation:

We know that

$L_T=L_S+10log(n)$

L_T= Total signal level in db

n= number of sources

L_S= signal level from signal source.

$L_T=60+10 log(5)$

= 66.98 db

7 0

1 year ago

At what distance above earth would a satellite have a period of 125 min?

Nezavi [6.7K]

Rw^2 = GmM/r^2
 Leads to
 w^2 r^3 = GM
 (2pi /T) ^2 r^3 = GM
 4pi^2 r^3 = GM T^2
 r^3 = GM T^2 / 4pi^2
 Work out r^3 then r.
 T = 125 min = 125(60) = 7500 s
 R = 6.38E6 m
 m = 5.97E24 kg
 G = 6.673E-11
 r= 8279791.78 m
Since r = radius R of Earth + height above urface,h
 h = r - R = 8279791.78 - 6.38E6 = 1899791.78 m
h= 1899.79178 Km

5 0

1 year ago

Read 2 more answers

A projectile has an initial horizontal velocity of 15 meters per second and an initial vertical velocity of 25 meters per second

Artyom0805 [142]

Answer:

75 m

Explanation:

The horizontal motion of the projectile is a uniform motion with constant speed, since there are no forces acting along the horizontal direction (if we neglect air resistance), so the horizontal acceleration is zero.

The horizontal component of the velocity of the projectile is

$v_x = 15 m/s$

and it is constant during the motion;

the total time of flight is

t = 5 s

Therefore, we can apply the formula of the uniform motion to find the horizontal displacement of the projectile:

$d= v_x t =(15 m/s)(5 s)=75 m$

5 0

2 years ago