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4 years ago

I NEED HELP PLEASE, thanks! :)

Physics

1 answer:

topjm [15]4 years ago

6 0

Answer:

2.96×10⁸ m/s

Explanation:

Speed = distance / time

v = (2 × 3.85×10⁸ m) / (2.60 s)

v = 2.96×10⁸ m/s

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A baseball has a mass of 0.145 kilograms, and a bowling ball has a mass of 6.8 kilograms. What is the gravitational force betwee

Olegator [25]

Quite low

Gravitation force = $\frac{6.67* 10^{-11}*0.145*6.8 }{ 0.5^{2} }$ = 26.3 * $10^{-11}$ = 2.63 * $10^{-10}$ N

6 0

3 years ago

Read 2 more answers

6. According to Ohm's Law, current (I), voltage (V), and resistance (R)

SIZIF [17.4K]

Answer: C

Explanation: according to the law voltages = to current and resistance

7 0

3 years ago

I am desperate to get to Denver, Colorado to catch the Denver Broncos

Pavlova-9 [17]

Answer:

<em>The average speed needed is 68.4 mi/h</em>

Explanation:

<u>Average Speed </u>

If an object travels a distance d in a time t regardless of the direction, the average speed is the quotient of the distance over the time:

$\displaystyle V=\frac{d}{t}$

The distance to get to Denver from the Hamilton Street Campus is d=1,778 miles. An estimated time of t=26 hours should be needed to cover that distance, thus you will need to travel at an average speed of:

$\displaystyle V=\frac{1,778\ mi}{26\ h}$

V = 68.4 mi/h

The average speed needed is 68.4 mi/h

6 0

3 years ago

A car's bumper is designed to withstand a 6.84 km/h (1.9-m/s) collision with an immovable object without damage to the body of t

PilotLPTM [1.2K]

Answer:

859.07 N

Explanation:

u = Initial velocity = 1.9 m/s

v = Final velocity

s = Displacement = 0.165 m

a = Acceleration

m = Mass = 890 kg

Equation of motion

$v^2-u^2=2as\\\Rightarrow a=\frac{v^2-u^2}{2s}\\\Rightarrow a=\frac{0^2-1.9^2}{2\times 0.165}\\\Rightarrow a=-10.93\ m/s^2$

Force

$F=ma\\\Rightarrow F=870\times -10.93\\\Rightarrow F=859.07\ N$

The magnitude of the average force on the bumper is 859.07 N

4 0

3 years ago

A corrosion cell consisting of Zinc and Nickel is formed. Which of the following statement is true? (A) Nickel will act as Anode

Yanka [14]

Answer: B) Zinc will act as Anode

Explanation:

Standard reduction potential of zinc and nickel are:

$E^0_{[Zn^{2+}/Zn]}= -0.76V$

$E^0_{[Ni^{2+}/Ni]}=-0.25V$

Here Zinc undergoes oxidation by loss of electrons, thus act as anode as it has more negative reduction potential.

Nickel undergoes reduction by gain of electrons and thus act as cathode. as it has less negative reduction potential.

$Zn+Ni^{2+}\rightarrow Zn^{2+}+Ni$

$E^0_{cell}=E^0_{cathode}- E^0_{anode}$

Where both $E^0$ are standard reduction potentials.

$E^0=E^0_{[Ni^{2+}/Ni]}- E^0_{[Zn^{2+}/Zn]}$

$E^0=0.25-(-0.76V)=0.51V$

As the emf is positive, the reaction is spontaneous and reaction will occur.

Thus Zinc will act as anode.

4 0

4 years ago