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Naddika [18.5K]
4 years ago
13

A rock is thrown downward with velocity 10 ft/sec from a bridge 100 ft above the water. how fast is the rock going when it hits

the water?
Physics
1 answer:
Vaselesa [24]4 years ago
8 0

A rock is thrown downward with velocity 10 ft/sec from a bridge 100 ft above the water. The velocity of the rock upon impact on the water can be solve using the formula:

V= sqroot(2gy) where g is the acceleration due to gravity and y the height

V= sqroot(2 (32.2 ft/s2) (100ft) = 80.25 ft/s

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A 200 N object is resting on a surface with a coefficient of static friction equal to 0.15. A person pushes horizontally with a
Reika [66]

Answer:

20 N

Explanation:

the force of static friction maximum = Fn * .15 = 200 * .15 = 30 N

  the force of friction will cancel out the 20 N force applied

    Ff = 20 N

3 0
2 years ago
A box has a force of 5 N that acts to the right. There is a second force of 10 N on the box acting to the left. What is the magn
Alexxandr [17]

Answer:

-5n

Explanation:

you have the positive force meaning the right which is acting with 5 Newton's. The negative we can assume to be the 10 Newton's to the left if you subtract them the resultant force should be -5 so ,5 Newton's to the left

4 0
3 years ago
Carla is babysitting her 2-year-old nephew for the first time. While her back is turned just for a moment, he touches the pan sh
defon

Answer:

Screaming is an emotional response triggered by the brain which receives information about the pain later as compared to pulling away of finger which is a reflex action facilitated by the spinal cord that has a quicker-time to response.

Explanation:

Reflex action happens when part of our body comes to contact with an object which can cause harm and you tend to quickly withdraw that part of the body.Reflex action happens quicker before the brain gets the time to process information about the harm.

When the baby touched the hot pan, at point of contact, skin receptors send nerve impulses to the spinal cord. Interneurons in the spinal cord relay a response to motor neurons to stimulate muscle contraction making the baby to pull his finger away.This happens so fast before the brain receives the message later to trigger emotional response(screaming).

4 0
4 years ago
Hai vận động viên chạy trên cùng 1 đoạn đường, vận động
Vladimir [108]

Answer:

Pemain A

Explanation:

Mengingat data berikut;

Kecepatan pemain A = 12 m/s

Kecepatan pemain B = 36 km/h

Untuk menentukan siapa pelari tercepat di antara dua pemain;

Pertama-tama, kita harus mengubah kecepatan menjadi satuan standar pengukuran yang sama.

Jadi, mari kita gunakan pengukuran umum meter per detik.

Konversi:

36 km/h = (36 * 1000)/(60 * 60)

36 km/h = 36000/3600

36 km/h = 10 m/s

Kecepatan pemain B = 10 m/s

Oleh karena itu, dibandingkan dengan kecepatan pemain A; pemain A lebih cepat.

6 0
3 years ago
A force of 200 N is applied on small piston of a pascal press. What would be the
VladimirAG [237]

Answer:

The force applied on the big piston is 1306.67 N

Explanation:

Given;

force applied on small piston, F₁ = 200 N

diameter of the small piston, d₁ = 4.37 cm

radius of the small piston, r₁ = d₁/2 = 2.185 cm

Area of the small piston, A₁ = πr₁² = π(2.185 cm)² = 15 cm²

Area of the big piston, A₂ = 98 cm²

The pressure of the piston is given by;

P = \frac{F}{A} \\\\\frac{F_1}{A_1} = \frac{F_2}{A_2}\\\\ F_2 = \frac{F_1A_2}{A_1}

Where;

F₂ is the force on big piston

F_2 = \frac{200*98}{15} \\\\F_2 = 1306.67 \ N

Therefore, the force applied on the big piston is 1306.67 N

3 0
3 years ago
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