A man is riding his 4-wheeler at 60 km/hr. If he is riding it constantly at this rate for 1.5 hours, how far did he ride?

Naya [18.7K]

Molecules in the air scatter blue light from the sun more than they scatter red light.

7 0

3 years ago

Fter carrying out some tests at a local stream, you discover that the pH in the stream is extremely low. Based on this, you shou

n200080 [17]

Answer:

D) not swim in or drink the water from the stream

Explanation:

Low pH means the water is acidic which is harmful to your skin as it can cause burns and irritations. So any means of contacting with water is not healthy. The damage to the skin happens as in acidic water it has more H+ than in the neutral water and the extra H+ ions can ionize the atoms which are combined to form different compounds in the skin when in contact.

5 0

3 years ago

Read 2 more answers

Nick, a 60 kg physics student, wants to go bungee jumping, but doesn't have a bungee cord. He finds a 15 m long, strong spring (

vitfil [10]

Answer:

h = 24.81 m

Explanation:

Given:-

- The mass of the student, m = 60 kg

- The length of the spring, L = 15 m

- The spring constant, k = 60 N/m

Find:-

How far below the bridge is he hanging

Solution:-

- First realize that after the student attempts a bungee jump he oscillates violently ( dynamic motion ). After some time all the kinetic energy has been converted to Elastic and gravitational potential energy student is (stationary) and hanging down on one end of the spring.

- We will apply equilibrium condition on the student. We see that there are two forces acting on the student. The weight (W) of the student acting downward is in combat with the spring restoring force (Fs) acting upwards.

- Apply equilibrium condition in vertical direction:

Fs - W = 0

Fs = W

- The weight and spring force can be expressed as:

k*x = m*g

Where, g : Gravitational acceleration constant = 9.81 m/s^2

x : The extension of the spring from original position

- Solve for the extension (x) of the spring for this condition.

x = m*g / k

- Plug in the values and evaluate:

x = (60 kg)*(9.81 m/s^2) / (60 N/m)

x = 9.81 m

- The spring extends for about 9.81 m from its original length. So the distance (h) from edge of the bridge would be:

h = L + x

h = 15 + 9.81

h = 24.81 m

4 0

3 years ago

A body builder loads a bar with 550 newtons (~125 pounds) of weight and pushes the bar over her head 10 times. Each time she lif

Neporo4naja [7]

Work = (force) x (distance)

(550 newtons) x (0.5 meter) = 275 joules each lift .

(275 joules/lift) x (10 lifts) = 2,750 joules of work all together.

Power = (work done) / (time to do the work)

= (2,750 joules) / (20 seconds)

= 137.5 watts . (about 0.18 horsepower)

6 0

3 years ago

An automobile with a mass of 1250 kg accelerates at a rate of 4 m/sec2 in the forward direction. What is the net force acting on

kotegsom [21]

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