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2 years ago

A cat has a mass of 3 kg and runs at a speed of 6 m/s. How much kinetic

Physics

2 answers:

kupik [55]2 years ago

7 0

Answer:

$kinetic \: energy = \frac{1}{2} \times m {v}^{2}$

1/2 × 3 × 6² = 54J

Maslowich2 years ago

3 0

Answer:

54 Joules

Explanation:

recall that kinetic energy is governed by the equation:

K.E = (1/2) mv²

where,

m = mass = given as 3 kg

v = velocity = given as 6 m/s

Substituting these known values into the above equation,

K.E = (1/2) mv²

K.E = (1/2) (3)(6)²

K.E = 54 Joules

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A protein molecule in an electrophoresis gel has a negative charge.The exact charge depends on the pH of the solution, but 30 ex

Ad libitum [116K]

Answer:

The magnitude of the electric force on a protein with this charge is $7.2\times10^{-15}\ N$

Explanation:

Given that,

Electric field = 1500 N/C

Charge = 30 e

We need to calculate the magnitude of the electric force on a protein with this charge

Using formula of electrostatic force

$F=Eq$

Where, F = force

E = electric field

q = charge

Put the value into the formula

$F=1500\times30\times1.6\times10^{-19}$

$F=7.2\times10^{-15}\ N$

Hence, The magnitude of the electric force on a protein with this charge is $7.2\times10^{-15}\ N$

6 0

3 years ago

A school bus moves at speed of 35mi/he for 20miles. How long will it take for the bus to get to school

lara [203]

Answer:

Time, t = 0.57 hours

Explanation:

It is given that,

Speed of the school bus, v = 35 mi/hr

Distance covered by the bus, d = 20 miles

We need to find the time taken by the bus to get to school. Time taken by the bus is given by :

t = 0.57 hours

So, the time taken by the bus to reach school is 0.57 hours. Hence, this is the required solution.

8 0

2 years ago

Essential Questions: What does the particle theory tell us about the nature of matter? How does

Ede4ka [16]

sowwie :( i need points

Explanation:

5 0

2 years ago

When a clock reads 5.0 seconds a cart's velocity in the negative x direction is 3.0 m/s. when the clock reads 6.0 seconds, the c

DIA [1.3K]

Impulse is the change of momentum before and after the collision:
I = mv₁ - mv₂ = m (v₁-v₂)
m mass
v velocity

Impuls also is defined as the average force during a short period of time:
I = F * t = m * a * t
F average force
t time difference
m mass
a average acceleration

Combined:
m(v₁- v₂) = m * a * t
a = (v₁- v₂) / t
= (4m/s - (-3m/s)) / 6s - 5s
= 7m/s / 1s
= 7 m/s²

7 0

3 years ago

A ski tow operates on a 15.0° slope of length 300 m. The rope moves at 12.0 km/h and provides power for 50 riders at one time, w

Whitepunk [10]

Answer:

A power of 29562.1 W is required to operate the tow.

Explanation:

Given:

Angle of inclination (x) = 15.0°

Length of slope (L) = 300 m

Mass of each rider = 70 kg

Number of riders = 50

Speed of rope (v) = 12 km/h

Now, mass of the 50 riders (m) = Mass of 1 rider × Number of riders

= 70 × 50 = 3500 kg

The force acting on the tow is the component of weight of 50 riders in the direction opposite to the motion of the tow.

The component of weight along the slope is given as:

$F_{slope}=mg\sin x=3500\times 9.8\times \sin 15^\circ = 8877.5\ N$

Now, the tow must apply the same force in the direction of motion to move it at constant speed.

Now, speed is in km/h. So, we need to convert it to m/s using the conversion factor.

We know that, 1 km/h = 5/18 m/s

Therefore, 12.0 km/h = $12\times \frac{5}{18}=3.33\ m/s$

Therefore, the minimum power required to operate the tow is given by the formula:

Power = Force × Velocity

$P=8877.5\times 3.33=29562.1\ W$

Therefore, a power of 29562.1 W is required to operate the tow.

3 0

3 years ago