Pls Help

A bomb goes off next to the wall of a church. Fortunately, no one is hurt. The wall runs East to West and the bomb was just South of it. A forensics expert finds two fragments in the wall. From their penetration, she estimates they were both moving at 100 m/s. The first hit 34o West of North and had a mass of 3.1 kg. The second hit 41o East of North and had a mass of 4.6 kg. The expert suspects that there was an additional large fragment she needs to recover. Unfortunately, the wall faces a large field and searching the whole field will take time. The sooner she recovers the bomb parts, the better for the investigation.

a) [45 points] In what direction should the forensics expert order a search? Express your direction as a compass angle in degrees clockwise from North for the officers with metal detectors. Define you axes.

b) [15 points] Assuming the missing fragment had the same speed as the recovered fragments, what is its mass?

It's on chegg if anyone pays for that :(

Aroll in a paper machine is powered by a separately excited dc machine. operating point 1 (under load): the roll typically operates at 764 rpm and must provide 301 nm of torque to oppose the load of the paper. the armature voltage is 230v for this operating point operating point 2 (no load): when the load is removed the speed of the roll increases to 900 rpm (the field characteristics are unchanged) la ea dev m (a) calculate the maximum torque (units of nm) that the motor can supply with this applied voltage (b) calculate the value of the armature resistance, ra (in ohms) (c) at operating point 1 (loaded condition), the field current, i, and the total input power (armature field), are measured to be to be 10 a and 28,600 w respectively. use this information to calculate the value of the field resistance, rf (in ohms). (d) (d) at operating point 1 (loaded condition), calculate the motor efficiency. express your answer as a percent to at least 2 significant digits. (d) if the field voltage is reduced by 1/2, calculate the new stall torque (in nm) of the motor (f). if the field voltage is reduced by 1/2, calculate the new no-load speed (in rad/sec)

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid