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3 years ago

(will mark brainliest)Which of the following has the most potential energy?

Physics

2 answers:

Anastasy [175]3 years ago

7 0

A car speeding down a 20 foot hill

Mashcka [7]3 years ago

5 0

The correct answer is a car at the top of a 20 foot hill.

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A 4.00-kg mass and a 9.00-kg mass are being held at rest against a compressed spring on a frictionless surface. When the masses

IgorLugansk [536]

Answer:

B) 0.500 m/s West

brainlist answer

4 0

3 years ago

A car with a mass of 800 kg, moving at +15 m/s, crashes head on with a 1500 kg truck moving at -45.5 m/s in the opposite directi

Sloan [31]

Answer:

v = -24.5 m/s

Explanation:

Use conservation of momentum P = m*v. Unless there are external forces involved, total momentum must be conserved.

P: momentum

m: mass

v: velocity

1. calculate the total momentum before the collision:

$P=m_{car}v_{car} + m_{truck}v_{truck}$

2. the total momentum after the collision must not change:

$P_{before}=P_{after}$

3. after the collision the velocity of the car is the same as the velocity of the truck:

$v = v_{car} = v_{truck}$

4. combining 2. and 3.:

$P= (m_{car}+m_{truck})v$

5. this equation only has one unknown and can be solved for v:

$v = \frac{P}{m_{car}+m_{truck}} =\frac{m_{car}v_{car} + m_{truck}v_{truck}}{m_{car}+m_{truck}}$

$v=\frac{800*15 + 1500 * (-45.5)}{800 + 1500} = -24.5$

3 0

4 years ago

The smaller the load a river has the more sediment it can carry??? True or false?? Help!! Need it ASAP

Mrrafil [7]

False, the smaller the load a river has the more sediment it can carry

6 0

3 years ago

¿Qué proporción deberían guardar los platos de una prensa hidráulica para que, aplicando 40N de fuerza en el plato menor, podamo

9966 [12]

Answer:

El área de la placa más grande es aproximadamente 9,81 veces el tamaño del área de la placa más pequeña

Explanation:

Los parámetros dados son;

La fuerza aplicada sobre la placa más pequeña, F = 40 N

El culo del objeto levantado en la placa más grande, m = 40 kg

El peso del objeto, W = 40 kg × 9,81 m / s² = 392,4 N

Tenemos la presión en el plato pequeño = La presión en el plato más grande

Por lo tanto;

F / A₁ = W / A₂

Dónde;

A₁ = El área del plato pequeño

A₂ = El área de la placa más grande

Por lo tanto, obtenemos;

40 N / (A₁) = 392,4 N / (A₂)

A₂ / A₁ = 392,4 N / (40 N) = 9,81

∴ A₂ = A₁ × 9,81

El área de la placa más grande, A₂ = 9,81 (9,81 m / s² ≈ g) multiplicado por el área de la placa más pequeña A₁.

3 0

3 years ago

A comet is cruising through the Solar System at a speed of 50,000 kilometers per hour for 4.5 hours time. What is the total dist

PSYCHO15rus [73]

Answer:

The total distance traveled by the comet is 225000 [km]

Explanation:

In order to determine the travel distance we must use the following kinematics equation:

x = v*t

where:

x = distance traveled [km]

v = velocity = 50000 [km/h]

t = time = 4.5 [h]

x = 50000*4.5 = 225000 [km]

4 0

3 years ago