Which statements about intensity are correct

It carries acurrent of 6. The dens Q: Green-Black-Blue-Silver is the color band for a given resistor, determine the resistance in Ohms do A: The band green corresponds to a digit 5. The band black corresponds to a digit 0 The band blue corre Q: The box is at rest at point I when it is sliding down the incline.

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What does it read in N when it is l A: The weight of the copper, The volume of the copper,. Q: You have a summer job working at a company developing systems to safely lower large loads down ramps Q: Four objects are held in position at the corners of a rectangle by light rods as shown in the figure A: "Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts f Q: The electric motor of a model train accelerates the train from rest to 0. The tot Q: answer of this mcq with solution??

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A: When work is done equal amount of energy is transferred or consumed. Power is defined as the rate of Q: A force of 12 Ib is required to hold a spring stretched 2 in. How much wo Q: The capacitors in the figure are initially uncharged. These guidelines recommend that for good health, you should aim for at least 30 minutes of moderate intensity physical activity on most days, in addition to a general message of moving more and sitting less.

This is the same for women and men. Pre-exercise screening is used to identify people with medical conditions that may put them at a higher risk of experiencing a health problem during physical activity. Ensure you read through the pre-exercise self-screening tool before you embark on a physical activity or exercise program.

Measuring exercise intensity There are various ways to measure your exercise intensity to make sure your body is getting the most out of every workout. You may need to experiment to find out which method of measuring exercise intensity suits you best. Three different measurement methods include: target heart rate talk test exertion rating scale. Measuring exercise intensity using your target heart rate The human body has an in-built system to measure its exercise intensity — the heart.

Your heart rate will increase in proportion to the intensity of your exercise. For moderate-intensity physical activity, a person's THR should be 50 to 70 per cent of their maximum heart rate. The maximum rate is based on a person's age.

An estimate of a person's maximum heart rate can be calculated as beats per minute bpm minus your age. Because it is an estimate, use it with caution.

Keep your heart rate at the lower end of your recommended range if you are just starting regular exercise. Gradually increase the intensity of your workouts as your fitness improves. Also, your heart rate should stay in the lower ranges during warm-up and cool-down periods. Your heart rate target range may need to be professionally recalculated to take your health and general fitness into account. Solution 1. Calculate to find the sound intensity level in decibels: 10 log 10 5.

Discussion This 87 dB sound has an intensity five times as great as an 80 dB sound. Example 2. Show that if one sound is twice as intense as another, it has a sound level about 3 dB higher. Strategy You are given that the ratio of two intensities is 2 to 1, and are then asked to find the difference in their sound levels in decibels. Identify knowns. We wish to show that the difference in sound levels is about 3 dB.

Discussion This means that the two sound intensity levels differ by 3. Check Your Understanding Part 1 Describe how amplitude is related to the loudness of a sound. Solution Amplitude is directly proportional to the experience of loudness. Part 2 Identify common sounds at the levels of 10 dB, 50 dB, and dB. Solution 10 dB: Running fingers through your hair.

Conceptual Questions Six members of a synchronized swim team wear earplugs to protect themselves against water pressure at depths, but they can still hear the music and perform the combinations in the water perfectly. One day, they were asked to leave the pool so the dive team could practice a few dives, and they tried to practice on a mat, but seemed to have a lot more difficulty.

Why might this be? The current sound intensity level, even though the rail yard is blocks away, is 70 dB downtown. The mayor assures the public that there will be a difference of only 30 dB in sound in the downtown area. Should the townspeople be concerned?

The warning tag on a lawn mower states that it produces noise at a level of What is this in watts per meter squared? What is the intensity of the wave? What intensity level does the sound in the preceding problem correspond to? What sound intensity level in dB is produced by earphones that create an intensity of 4. What is the intensity of this sound in watts per meter squared?

If a large housefly 3. Ten cars in a circle at a boom box competition produce a dB sound intensity level at the center of the circle. What is the average sound intensity level produced there by each stereo, assuming interference effects can be neglected? The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound intensity level goes up by What is the maximum gauge pressure in a dB sound?

An 8-hour exposure to a sound intensity level of What energy in joules falls on a 0. What decibel increase does an ear trumpet produce if its sound gathering area is cm 2 and the area of the eardrum is 0. Sound is more effectively transmitted into a stethoscope by direct contact than through the air, and it is further intensified by being concentrated on the smaller area of the eardrum.

It is reasonable to assume that sound is transmitted into a stethoscope times as effectively compared with transmission though the air.